Phase plan 2026-04-18 — post-merge-wave coordination snapshot

[briansrls]

Summary

Lands docs/phase-plan-2026-04-18.md as the director-chat coordination snapshot for the post-merge-wave phase. Derived from the 2026-04-18 draft with director review baked in.

What the doc is:

• §1: snapshot of where the four lanes stand after tonight's 10 merges (with exact commit SHAs).
• §2: current in-flight dispatches + per-chat acceptance.
• §3: paste-ready dispatch briefs for the next batch (Python pilot, lens-name-filter dissolution, combined XS asymmetry + planner alignment).
• §4: medium-horizon pre-clearance, with the discipline that existing DB docs count as pre-clearance.
• §5: tracked debt split — already-in-ROADMAP (point to authority) vs migration candidates.
• §6: Stage 3c readiness exploration — the strategic-horizon work that the draft left sparse.
• §7: operating model + refresh cadence + DB-numbering discipline.

Director review findings baked in:

• Staleness: main fix #523 was shown in-flight but already merged as 977224ac7 — doc reflects merged state.
• DB-numbering audit: dropped speculative DB-18/19/20/21/22 references. DB-7 (design-symbolic-cost-algebra.md), DB-8 (design-fixed-point-ratchet.md), DB-15 (design-test-infra.md) already cover the work the draft treated as un-pre-cleared. Also noted DB-17 is already allocated to reference-resolution-provenance per ROADMAP §Scheduled deletions, so the draft's use of DB-17 for WorkflowEffect would have collided.
• §4 Stage 2c/2d/3b/3c reframed from "un-pre-cleared" to "pre-cleared by DB-N; remaining work is audit + integration."
• §6 Stage 3c exploration filled in: compiler.dag is a 310-line cycle meta-model (NOT compiler internals); Lane 1 Stage 1e is a HARD blocker per lane3-self-hosting-cycle.md dependencies; 4 genuinely-open questions named (trivial-vs-meaningful compiler.dag expansion, bootstrap sequencing, v2-path carryover, determinism test placement).
• STOP-AND-ESCALATE rule added to each §3 dispatch brief + §7 — child chats halt when pre-clearance turns out to have been wrong, rather than patching forward and losing the structural signal.
• §5 split: items already in ROADMAP get pointed at their authority; migration candidates get explicit dispatch decisions (combined XS brief vs dedicated hygiene chat — NOT folded into XS).

What's next (NOT in this PR):

• Current §2 dispatches close in their own PRs.
• §3 briefs go out in order; Python pilot gated on PR 2.5.
• §5b migration via combined XS brief (§3) + dedicated hygiene chat.
• Next director session commits first 60 min to §6's open questions regardless of tactical surprises.

Test plan

• Doc renders cleanly on GitHub; parent-doc links to post-l15-phase-plan.md and src/v3/ROADMAP.md resolve
• Review: does the §5a/§5b split accurately classify existing-ROADMAP vs migration items?
• Review: does §6's substrate-readiness checklist match ROADMAP's active-deferrals row for each lane?
• Review: are the 4 open 3c questions (§6) the right ones for the next director-session 60-min block, or should any be reclassified?
• Review: is the STOP-AND-ESCALATE framing in §3/§7 load-bearing enough, or should it be elevated to an INVARIANTS.md entry?

🤖 Generated with Claude Code

[briansrls]

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[briansrls]

Read end-to-end. This isn't a passive landing of the director-chat draft — it's a substantive audit that corrected several errors in the draft and added load-bearing structural findings. Approve with commendation.

Corrections the audit made (load-bearing)

The single most important contribution of this PR is §4's audit finding that Stage 2c / 2d / 3b / 3c are already pre-cleared by existing DB docs. My draft framed them as "un-pre-cleared" and proposed speculative DB-18 / DB-19 / DB-20 numbers. Wrong:

• DB-15 (test-infra) already locks Stage 2c — ROADMAP's Lane 2 Stage 2c row names it directly.
• DB-7 (symbolic cost algebra) locks Stage 2d — carrier, composition rules, per-Behavior lowering (including Loop with recursion_depth_bound for mutual-recursion clusters), dead-work detection.
• DB-1 (correction shape) locks Stage 3b — lane3 doc defers to DB-1.
• DB-8 (fixed-point ratchet) locks Stage 3c mechanics — 4 mandatory steps, CI gate, determinism invariant, 8 sources of non-determinism.

This means next-session director-chat work is audit + confirm (DB-15 R2 read, DB-7 WorkflowEffect integration trace), not new design. That corrects a real scope error in my draft and prevents the next director session from wasting an hour re-deriving DB-7.

Also caught: the DB-17 collision. My draft reserved DB-17 for "WorkflowEffect" but DB-17 is already allocated to reference-resolution provenance per ROADMAP's Scheduled Deletions. The new "do not pre-reserve DB numbers" rule in §7 closes the footgun.

Structural improvements

STOP-AND-ESCALATE rules in each §3 dispatch brief — load-bearing. Named explicitly:

• Python pilot: HALT if contract needs shape change (over-fit signal must not be silently absorbed)
• Lens-name-filter dissolution: HALT if site 5 forces a new substrate variant

This converts the "children should escalate structural findings" rule from an implicit expectation into a named brief element. Mirror of the audit memo's Q-discipline — graduate implicit rules into named structural guardrails.

Snapshot discipline at the top (§Snapshot discipline): cross-check §1 merges against git log before dispatching. Caught that #523 already merged during the director review window. Concrete staleness check, not aspirational.

Throughput reality check at §2 footer: explicitly names director-throughput as the gating constraint when 4 chats are active, and §6 commits explicit time budgets (30 / 20 / remaining). This is the operational discipline that keeps the fan-out from stalling.

Explicit §7 discipline section — structural-finding escalation rule, status update discipline, refresh cadence, DB-numbering discipline. Each rule is a small memo-graduation in itself.

The Stage 1e finding is a strategic signal

§6's table + critical-path trace is a real discovery:

Critical path: 1a → 1b → 1c → 1d → 1e → 3c
Current: 1a ✅ / 1b 🟡 / 1c 🟡 / 1d ❌ not started / 1e ❌ not started / 3c ❌ gated on 1e.

This is not a minor finding. Multiple stages of Lane 1 work stand between current-state and 3c dispatch. My draft treated 3c as "strategic horizon, work toward it." This doc correctly identifies that 3c is execution-blocked on Stage 1e single-emitter consolidation, which hasn't started. That changes the post-M2 planning conversation entirely — next substantial Lane 1 push is the critical path to 3c, not 3c exploration itself.

§6's open questions are correctly narrow

Four genuine open questions for next director session, each grounded in reads of compiler.dag / DB-8 / lane3:

1. Does 3c fire on compiler.dag as-is (meta-model, 310 lines) OR on an expanded compiler.dag (compiler's logic expressed in .dag)? Different acceptance bars; pick one or declare both.
2. Bootstrap sequencing — compiler.dag doesn't currently contain parser/lowerer/emitter logic. Does 3c self-host the cycle-runner before self-hosting the compiler proper?
3. compiler.dag references v2 paths (src/v2/stage0/src, etc.) — Stage 3c operates on v3. A prerequisite PR to v3-centric-rewrite compiler.dag?
4. tests/determinism_test.rs (DB-8's per-fixture 5x re-run) should land as part of Lane 1 Stage 1e acceptance, not be deferred to 3c itself.

These are genuinely pre-clearance-worthy questions — not re-derivation of DB-8, but the integration-level decisions DB-8 intentionally left downstream.

Minor notes (non-blocking)

• §5a table of "already in ROADMAP active-deferrals" is the right discipline (pointer not duplicate) — appreciated.
• §5b's "dedicated ROADMAP-hygiene chat" recommendation for the 3 items that don't fit the XS brief is right — folding all 8 items into one XS chat would have been scope-overload and they'd rot unprocessed.
• The "since last refresh" timestamp discipline at the top is a small detail but a meaningful one for staleness tracking.

What this unblocks

• Next director session has a concrete 60-min time budget (DB-15 R2 read + DB-7 integration trace + §6 open questions).
• Children dispatching against §3 briefs have explicit STOP-AND-ESCALATE rules; silent drift away from contract is converted into a load-bearing signal.
• Stage 1e planning becomes visible as the critical-path post-M2 item rather than an abstract "3c readiness" goal.
• Memo graduation (feedback_substrate_principle_audit → INVARIANTS.md) has a named trigger condition (3rd citation in Python pilot dispatch).

Verdict

APPROVE. This is how the Lane E brief was supposed to work — not just land docs but audit them against repo ground truth. The corrections (pre-cleared-by-existing-DBs, DB-17 collision, Stage 1e critical path) prevent real future waste. Ready to merge.

Follow-ups that land with this doc:

• Next director-chat session opens this as first read (the doc self-documents its own operating model in §7).
• The dedicated ROADMAP-hygiene chat called for in §5b should be added to the dispatch queue when §3's current batch settles.
• Open questions 1-4 in §6 need answering in the next director session — budget ~30 min after the DB-15/DB-7 audit work.

[briansrls]

Addressed the review in commit b7b4dba89.

Both BLOCKING findings:

1. docs: DB-9 R2.1 — Track 9 substrate integrity primitives graduation #516 Track 9 primitive list — was NonEmptyList/NonSingletonList/ArityIndex/TransformRef; now restates from ROADMAP.md:765-768 as NonEmptyList<T>/NonSingletonList<T>/ParamRef/TransformRef, with explicit note that ArityIndex was rejected as a standalone primitive (ROADMAP:772).
2. ParamRef/TransformRef asymmetry duplication — §3 XS brief and §5b both instructed "add ROADMAP entry" for debt ROADMAP:777-786 already tracks. §3 brief now scopes to a substrate.dag cross-reference comment only; §5b row removed; §5a gains a pointer to the existing ROADMAP entry.

Non-blocking finding also addressed:

3. §6 Q3 compiler.dag v2-paths was a stranded planning fact — now listed in §5b as a migration candidate pending director pre-clearance.

Root cause: you were right that the deepest issue was read-model-vs-second-tracker ambiguity. Added explicit Snapshot-discipline rule: "This doc is a thin read-model over ROADMAP. When ROADMAP and this doc conflict, ROADMAP is right and this doc must be fixed — delete the restated fact, replace with a line reference." Also fixed the parent link from ../src/v3/ROADMAP.md (the sub-tracker I mistakenly referenced) to ../ROADMAP.md (the authoritative root).

Verified by grep: no remaining ArityIndex mentions except the "explicitly rejected" note, and no remaining "add ROADMAP entry" instructions for debt already tracked.

[briansrls]

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codex · gpt-5.4 · 697c3a53

✅ Review (blocking: 0, non-blocking: 1+/0-)

Non-blocking — Strengths

• docs/phase-plan-2026-04-18.md Docs-only coordination snapshot stays secondary to ROADMAP and its §6 self-hosting read matches current compiler.dag plus the locked Lane 1e-gates-3c dependency.

ROADMAP — Verified

• DB numbering audit: DB-15 test-infra, DB-8 fixed-point ratchet, and DB-17 reference-resolution provenance all exist at the cited paths, so §4's collision-avoidance notes check out.
• Lane 1 Stage 1c follow-ups: ROADMAP at PR head already carries the Python pilot, PR 2.5 PatternBindingRule cleanup, and post_emit_verifier rows this snapshot points child chats to.

✅ I did not find a thesis- or authority-level contradiction in the new snapshot.

[briansrls]

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ChatGPT Review

Principle audit.

Fail-closed. Satisfied. For a coordination snapshot, the relevant failure mode is mis-dispatch, and the doc now routes that through explicit authority-order and STOP-AND-ESCALATE rules rather than silent patch-forward (docs/phase-plan-2026-04-18.md:14-26, 108-110, 134, 340-344). That is behavioral, not structural, but this file is an implementation-level read-model, not substrate.

Illegal states unrepresentable. Mostly satisfied / lightly engaged. The doc cleanly separates in-flight work, pre-cleared design work, already-tracked debt, and new migration candidates instead of mixing them into one ambiguous queue (docs/phase-plan-2026-04-18.md:61-81, 158-244). For prose, that is the right shape.

Facts flow forward. One NON-BLOCKING concern. The new feedback_substrate_principle_audit rule does not fully land in a canonical repo authority yet, and the doc records it inconsistently: §1 says the ComposedEffect reshape already cited Q4, while §2 says its acceptance is tied to Q3 (docs/phase-plan-2026-04-18.md:49-51, 76). Since the thesis says claims should live in tracked authorities and the modeling discipline treats silent fact drops as violations, I would either promote this audit into INVARIANTS.md immediately or strip the citation-count bookkeeping out of the snapshot until that promotion happens (THESIS.md:1943-1946; docs/modeling-discipline.md:51-68).

Coproduct dissolution. Satisfied / not materially engaged. This PR introduces no new substrate enum or Rust coproduct; it is coordinating already-landed Track 9 / NoBody / effects work rather than committing a new compressed representation.

Single-authority metadata. Mostly satisfied, with the same NON-BLOCKING concern. The doc is much better than the earlier draft about pointing to existing ROADMAP rows and explicitly forbidding duplicate follow-up rows (docs/phase-plan-2026-04-18.md:146-152, 221-244). The weak spot is that the memo is temporarily acting as a second authority for a live review rule, and the Q4/Q3 mismatch is a concrete symptom (docs/phase-plan-2026-04-18.md:49-51, 76, 240; docs/modeling-discipline.md:130-147).

API-level enforcement. Mostly satisfied for this layer. The file turns coordination expectations into explicit read-first lists, acceptance gates, and halt rules (docs/phase-plan-2026-04-18.md:95-110, 122-135, 328-344), but those checks are still convention-level rather than structural. That is acceptable for a planning doc, but it is also why the audit memo should move into a standing invariant doc quickly if it is going to steer future substrate work (docs/modeling-discipline.md:149-164; THESIS.md:893-919).

Design question. Is Lane 3 Stage 3c self-hosting the cycle runner, or the compiler proper? §6 is the first place the snapshot says plainly that compiler.dag currently models the self-hosting cycle rather than parser/lowerer/infer/emitter logic (docs/phase-plan-2026-04-18.md:252-267, 304-312), while the root ROADMAP wording I can verify only commits Phase 1 to compiler.dag as single authority for the self-hosting cycle (ROADMAP.md:328-340). That boundary matters: a 3c “green” means something very different if it proves “the cycle runner regenerates cleanly” than if it proves “the compiler is materially self-hosted,” and the thesis’s self-inspection claim really cares about the latter (THESIS.md:929-950).

Verdict. APPROVE_WITH_COMMENTS. No blocking concerns. This snapshot is materially cleaner than the earlier shape: it behaves like a real read-model, stops re-inventing DB work that existing docs already own, and surfaces the 3c scope question instead of hiding it. My one ask is to clean up the feedback_substrate_principle_audit authority path before this document becomes the standing coordination hub.

LOOP HEALTH: converging — this round dissolves earlier duplication and turns remaining uncertainty into named upstream questions rather than fresh ad hoc fixes, but the memo-to-invariant handoff should happen soon so the process rule itself is no longer floating outside the canonical docs.

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Meta-Review (Loop Health)

According to a document from 2026-04-18, my meta-verdict is ⚖️ SHIP_WITH_DEBT.

Loop summary. The visible history shows 3 substantive rounds: 2 ChatGPT-browser audits and 1 codex-cli review, plus 2 browser placeholder/check-in posts. The supplied artifacts do not expose exact commit count, but they do show at least 2 visible revision states: a pre-fix draft that got REQUEST_CHANGES and a reround that got APPROVE_WITH_COMMENTS. Visible elapsed time is about 45 minutes from the first browser post at 05:20:53Z to the final browser audit at 06:05:35Z. So: N=3, M≥2 visible revisions (exact commit count not recoverable from the attachments), K=1, L=2.

Forward progress evidence. This loop did retire real debt. In the first substantive browser pass, the snapshot was caught drifting from ROADMAP on the Track 9 primitive list and re-opening debt that ROADMAP already carried; the reround confirms both issues were fixed. The earlier stranded compiler.dag note was also pulled forward into tracked debt instead of being left orphaned in §6. That is genuine convergence, not churn. More broadly, the repo is not stuck polishing substrate with no users: ROADMAP says the interpreter phase and bootstrap-modeling phase are done, review.dag already passes live integration, and L4 semantic verification is now unblocked enough to start. The surrounding program has real consumers moving forward.

Debt accumulation evidence. This PR is still a coordination surface, not a new execution consumer. The codex review explicitly treats it as a docs-only coordination snapshot, and both browser audits identify the core risk as authority drift between the snapshot and ROADMAP. The deepest question survives both rounds: is this file a thin read-model over ROADMAP alone, or a second tracker allowed to originate planning state? That means the debt class was reduced, but not eliminated. ROADMAP already warns that ~770 lines of declared types with zero consumers are “paper exercise, not structural proof.” This PR is better than that because it does have human coordination consumers, but it is still another surface that can drift unless its authority stays strictly secondary.

Findings graduating to invariants. This is where the loop underperformed. It fixed the current instance of “parallel tracker drift,” but it did not bank a structural rule that would prevent the next coordination snapshot from drifting the same way. The repo knows how to do that when it decides to: after the PR #445 meta-review found the same authority question repeating across 16 review events, it stopped patching instances and graduated the class into the Semantic authority after lowering invariant, explicitly because the loop kept finding new instances without a general rule naming the class. PR #525 did not do the analogous move for coordination snapshots.

Cheating signal. Low. The implementer is not hiding compromises. The reround’s improvement came from making the doc more explicit about deferring to ROADMAP, treating already-tracked debt as already tracked, and tightening the acceptance/escalation language. That is compromise with accounting, not quiet “good enough for now” patching. The problem here is not hidden shortcuts. The problem is that the snapshot’s authority contract is still convention-enforced rather than mechanically guaranteed.

Meta-verdict — ⚖️ SHIP_WITH_DEBT

This loop made real forward progress: it caught and fixed the main single-authority failure, and the remaining issue is small enough that another ordinary round is more likely to add wording polish than structural value. Merge it, accept the tracked process debt, and handle the only worthwhile follow-up outside this PR: bank a small rule that coordination snapshots may restate ROADMAP only as a derived read-model with explicit references, never as a second planning authority.

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codex · gpt-5.4 · 2fa08daa

⚠️ Review (blocking: 2, non-blocking: 1+/0-)

BLOCKING (2)

Root Cause

• ROADMAP.md Raw line-number citations were copied forward after ROADMAP edits instead of being re-verified against the live authority → refresh the references or switch this snapshot to stable section/heading links before using them to suppress follow-up rows.
• docs/post-l15-phase-plan.md The tentative DB renumbering note was treated as if the DB doc had been opened and locked → either create the real Stage 2c design doc first or roll sections 4/5/7 back to currently existing authorities and keep 2c explicitly un-pre-cleared.

Non-blocking — Strengths

• docs/phase-plan-2026-04-18.md Section 6's characterization of dsl/gunbc/compiler.dag checks out: it is a 310-line self-hosting-cycle/tooling model, not a declaration of parser/lowerer/emitter internals.

ROADMAP — Verified

• Lane 1e gates Stage 3c: docs/lane3-self-hosting-cycle.md and docs/post-l15-phase-plan.md both still make Lane 1 Stage 1e a hard prerequisite for Stage 3c, so the blocker framing is grounded.
• DB-17 allocation: src/v3/ROADMAP.md scheduled deletions plus docs/design-reference-resolution-provenance.md do reserve DB-17 for reference-resolution provenance, so the collision warning is accurate.

⚠️ The snapshot has useful Stage 3c/readiness analysis, but two load-bearing authority claims are not actually backed by the current repo and should be corrected before this becomes dispatch guidance.

[briansrls]

BLOCKING: This brief says the ParamRef/TransformRef asymmetry is already tracked at ROADMAP.md lines 777-786 and therefore forbids a new ROADMAP row, but those lines are not Track 9 and no matching entry exists in the current ROADMAP, so the dispatch is anchored to nonexistent authority in violation of the doc's own read-model discipline.

[briansrls]

BLOCKING: Stage 2c is marked pre-cleared by DB-15 via design-test-infra.md, but that file does not exist and the repo's only DB-15 mention is still the tentative renumbering note in docs/post-l15-phase-plan.md, so the snapshot promotes speculation into fake design authority.

[briansrls]

codex · gpt-5.4 · 2fa08daa

⚠️ Review (blocking: 2, non-blocking: 1+/0-)

BLOCKING (2)

Root Cause

• ROADMAP.md Raw line-number citations were copied forward after ROADMAP edits instead of being re-verified against the live authority → refresh the references or switch this snapshot to stable section/heading links before using them to suppress follow-up rows.
• docs/post-l15-phase-plan.md The tentative DB renumbering note was treated as if the DB doc had been opened and locked → either create the real Stage 2c design doc first or roll sections 4/5/7 back to currently existing authorities and keep 2c explicitly un-pre-cleared.

Non-blocking — Strengths

• docs/phase-plan-2026-04-18.md Section 6's characterization of dsl/gunbc/compiler.dag checks out: it is a 310-line self-hosting-cycle/tooling model, not a declaration of parser/lowerer/emitter internals.

ROADMAP — Verified

• Lane 1e gates Stage 3c: docs/lane3-self-hosting-cycle.md and docs/post-l15-phase-plan.md both still make Lane 1 Stage 1e a hard prerequisite for Stage 3c, so the blocker framing is grounded.
• DB-17 allocation: src/v3/ROADMAP.md scheduled deletions plus docs/design-reference-resolution-provenance.md do reserve DB-17 for reference-resolution provenance, so the collision warning is accurate.

⚠️ The snapshot has useful Stage 3c/readiness analysis, but two load-bearing authority claims are not actually backed by the current repo and should be corrected before this becomes dispatch guidance.

[briansrls]

Respectfully, both BLOCKING findings from this codex review are factually incorrect against the current tree (HEAD = 2fa08daad). Verifying inline before making changes:

Finding 1 (ROADMAP.md:777-786 is not Track 9; entry does not exist): Track 9 starts at ROADMAP.md:730 (### Track 9: Missed algebraic structures in std/ (Lane D)) and extends to ROADMAP.md:795 (next section header is ### Track 10: Extdeps modeling fidelity (Lane D) at line 796). Lines 777-786 are inside Track 9 and contain the exact entry cited:

777: **Tracked debt — substrate constructor-validation asymmetry.**
778: `ParamRef` and `TransformRef` already move the witness SHAPE into the
779: reflected substrate, but their validity still depends on Rust-side sole
780: producers (`param_of(member, slot) -> ParamRef?`,
781: `as_transform_ref(node) -> TransformRef?`). Until `.dag`-side
782: construction matures, a direct reflected producer could still construct
783: the raw record fields without those fail-closed checks. Graduation
784: trigger: Lane 3 Stage 3c self-hosting cycle grows equivalent `.dag`-side
785: constructor authority, so the substrate contract and the Rust helper
786: story converge.

That is the debt entry I cited. It exists, in Track 9, at the cited lines.

Finding 2 (design-test-infra.md does not exist; DB-15 is speculation):

$ ls -la docs/design-test-infra.md
-rw-r--r--  1 briansrls  staff  18708 Apr 18 01:03 docs/design-test-infra.md

$ head -7 docs/design-test-infra.md
> Part of: [post-l15-phase-plan.md](./post-l15-phase-plan.md) | Unblocks: Lane 2 Stage 2c

# Design DB-15 R2 — Tests as declarations in the dependency DAG

**Design blocker:** DB-15 (test infrastructure that consumes the compiler's dependency-analysis machinery)
**Consumer:** Lane 2 Stage 2c (test obligation materialization) — forcing function
**Status:** Revision 2 (discussion draft). R1 was rejected — see Correction history below.

The file exists, is 18708 bytes, and is explicitly titled as the DB-15 R2 design doc. Stage 2c pre-clearance against this doc is grounded, not speculative.

Happy to re-verify against a specific SHA if this review was run against a different tree than 2fa08daad, but against the current HEAD both findings are falsifiable and falsified. Not making changes based on them.

[briansrls]

ChatGPT Review

Principle audit.

Fail-closed. Satisfied. For this implementation-level coordination doc, the relevant failure mode is process drift, and the updated text now fails closed by saying explicitly that feedback_substrate_principle_audit promotion is not tracked here and must happen as a separate follow-up, rather than silently letting the snapshot serve as the promotion counter (docs/phase-plan-2026-04-18.md:49-51). That is behavioral rather than structural, which is appropriate for this layer under the discipline lens (docs/modeling-discipline.md:17-32).

Illegal states unrepresentable. Satisfied / lightly engaged. The new edit removes an ambiguous hybrid state where the same section was both “session memo” and “graduation ledger.” Stripping the ≥3 citations → graduate bookkeeping and deleting the corresponding migration row leaves the snapshot with one role again: coordination read-model, not rule-authority (docs/phase-plan-2026-04-18.md:49-51, 236-243). This is behavioral cleanup, but it does make the prose model less able to admit the wrong state (docs/modeling-discipline.md:34-49).

Facts flow forward. Satisfied. The doc now handles the audit-memo fact honestly: it either lives in the snapshot as a memo or it graduates elsewhere, and the snapshot says which. That is exactly the “carry it forward or explicitly discard with a reason” shape the discipline asks for; the earlier half-tracked citation bookkeeping is gone (docs/phase-plan-2026-04-18.md:49-51, 236-243; docs/modeling-discipline.md:51-68). For a prose artifact, this is the right behavioral form.

Coproduct dissolution. Not materially engaged, and nothing here worries me. These commits do not introduce a new substrate enum or any new compressed coordination taxonomy. If anything, they move the file slightly away from inventing a pseudo-state machine around memo promotion.

Single-authority metadata. Satisfied, and this is the main result of the reround. The previous non-blocking concern is addressed: the snapshot no longer tries to own the feedback_substrate_principle_audit promotion criteria, and the debt table no longer tracks that promotion as if this file were the authoritative workflow ledger (docs/phase-plan-2026-04-18.md:49-51, 236-243). That aligns with the thesis’s warning that dual representations drift and raise change cost (THESIS.md:99-104, 732-755) and with the discipline’s “one canonical location” rule (docs/modeling-discipline.md:130-147). The enforcement is still behavioral, but the doc is now playing the correct role.

API-level enforcement. Satisfied for this layer. Nothing here is type-enforced, but the new change is careful not to pretend otherwise: it removes a fake process mechanism instead of dressing it up as one. The doc now states a convention and leaves canonical enforcement to the eventual authority doc, which is the honest outcome for a planning snapshot (docs/phase-plan-2026-04-18.md:49-51; docs/modeling-discipline.md:149-164).

Design question. What is the canonical promotion path for session-banked review rules like feedback_substrate_principle_audit once they prove useful across multiple PRs? These commits correctly stop the snapshot from being the promotion ledger, but that only pushes the deeper process question into the open: some other authority needs to own the trigger, destination, and acceptance for “memo becomes standing invariant.” If that path stays implicit, future coordination docs will be tempted to grow the same kind of bookkeeping again, recreating the shadow-authority shape this change just cleaned up.

Verdict. APPROVE. The new commits do the right thing: they remove the one place where this snapshot had started to behave like a second authority, and they narrow the debt table to items this doc actually owns. I do not see a new structural concern in the updated diff.

LOOP HEALTH: converging — this round dissolves the prior shadow-authority bookkeeping instead of moving it around, and the only remaining work is to formalize the memo→authority promotion path outside the snapshot.

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Meta-Review (Loop Health)

According to a document from 2026-04-18, this loop did make real forward progress, but it has now hit diminishing returns. The bluff to call is: stop polishing this snapshot and merge it with tracked debt. The remaining problem is no longer in PR #525’s prose; it is the missing canonical home for the feedback_substrate_principle_audit rule and the still-fuzzy boundary of what this snapshot is allowed to authoritatively say. Another round on this PR will mostly move that debt around.

Loop summary

Observed in the attached history: 4 substantive browser review passes, 2 codex-cli reviews, and 4 browser “review in progress” status posts, spanning 05:20:53Z to 06:53:30Z, or about 93 minutes. The attached materials do not expose the raw git commit list, so the best supported commit count is M≈4 visible revision turns rather than an exact git count.

Forward progress evidence

The loop paid off a real blocker, not just cosmetic nits. The first browser pass flagged a genuine single-authority violation: the snapshot misreported the Track 9 primitive list and re-opened ParamRef/TransformRef debt that ROADMAP already tracked. That was not reviewer noise; ROADMAP’s canonical Track 9 entry really does say NonEmptyList, NonSingletonList, ParamRef, and TransformRef, explicitly rejects ArityIndex, and already carries the constructor-validation asymmetry debt. Later rounds confirm those issues were fixed.

The loop also improved fact accounting. The earlier stranded compiler.dag v2-path note was moved into tracked debt instead of being left as an orphan observation, and the snapshot stopped acting like the promotion ledger for feedback_substrate_principle_audit. The final browser pass explicitly says the doc no longer tries to own that promotion criteria and is now narrower about what it owns. That is debt repayment, not debt hiding.

But under your Principle 1, there is an important limit: this PR is still docs-only. The reviews repeatedly describe it as a prose coordination snapshot, not a substrate/API change. So the loop did not enable a new machine consumer such as a test path, emitter path, or interpreter path. Its only new consumer is the human coordination surface itself. That matters because the project’s own roadmap says the highest-leverage work is wiring existing modeling into structural consumers, not polishing decorative surfaces.

Debt accumulation evidence

The same root issue keeps resurfacing in slightly different costumes: is this doc a thin read-model, or is it becoming a second tracker? That question appears in the first blocking browser review, remains the “deepest structural question” in the next reround, then mutates into the memo-authority problem, and finally survives as “what is the canonical promotion path” for feedback_substrate_principle_audit. That is exactly the pattern your Principle 3 warns about: the class was narrowed, but it was not graduated into a canonical invariant during this PR.

There is also clear evidence that later fixes got cheaper and more local. The first round fixed a real blocker. The next rounds are mostly about attribution wording, citation bookkeeping, and stopping the memo from behaving like a second authority. That is a healthy sign of convergence, but it is also the textbook sign that the next round’s marginal value is low. The reviews themselves say the remaining checks are still behavioral rather than structural. Once you are in that territory, more iteration on this doc is not buying the kind of closure your discipline wants.

Codex’s late review is the tell that the loop is no longer discovering new product truth; it is finding more authority-surface hygiene: raw line-number citations copied forward after ROADMAP edits, and a tentative DB renumbering note treated as if a DB doc had been opened and locked. Those are real issues, but they are the same species of “snapshot acting too authoritative” debt, not a new design breakthrough.

Cheating signal

Low cheating signal. The implementer is documenting compromises instead of hiding them. The later reviews explicitly praise the doc for saying “do not add a new ROADMAP entry,” for moving the compiler.dag carryover into tracked debt, and for deleting the fake ≥3 citations → graduate bookkeeping so the snapshot stops impersonating a canonical rule ledger. That is honest accounting.

But the latest fixes are only structural for a docs artifact, not structural in the project-wide sense. The reviews keep noting that enforcement here is still convention-level, and the modeling discipline is clear that facts must flow forward to a single authority and API-level enforcement beats convention. So the remaining problem is not “the implementer is cheating.” The remaining problem is “the real fix belongs in a canonical authority doc, not this snapshot.”

Meta-verdict

⚖️ SHIP_WITH_DEBT

Merge PR #525.

Why: the loop already harvested the high-value findings. It stopped a real parallel-tracker failure, repaired the Track 9/ROADMAP drift, carried a stranded planning fact forward, and stripped out the fake promotion-ledger behavior. What remains is a smaller, repeat-recurring class: where does a session-banked review rule become canonical? That is not going to be solved by another edit pass on this snapshot. It needs a follow-up that touches the actual authority surface, most likely INVARIANTS.md or an equivalent process-authority document.

The direct call: this loop is not shifting debt overall, but the next round almost certainly would. Merge now, and make the next PR do exactly one thing: graduate feedback_substrate_principle_audit into a canonical invariant or define the memo→authority promotion path there.

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