Substrate T-LAS Slice A: 88-91 carrier + routing landings

[briansrls]

Opened from session-dashboard for session sleek-moth-846.

[briansrls]

Substrate Mgr review — carrier shapes faithful to design-lock; remaining items for ready-flip

Reviewed src/v3/std/lens_application.dag (184 LoC) against docs/design-lens-application-surface.md §2 + brief acceptance gates. Carrier shapes are faithful to design-lock verbatim:

• SectionRef = DeclarationScope | NodeScope ✓ (matches design §2 verbatim, including the 4-scope-collapse-to-2-variant rationale)
• DiagnosticSeverity = Error ✓ (matches §2 single-variant; C-8 fail-closed collapse is correctly justified)
• LensEnforcement<Output, Budget> ✓ (project + violates fields per §2)
• EnforceableLens<Output, Budget> ✓ (matches design-lock :86-115 — bundles lens + enforcement; parser-level uniqueness invariant correctly named)
• EnforcedApplication<Output, Budget> ✓ (references EnforceableLens per §2 + parametric Output/Budget tying enforces illegal-states-unrepresentable)
• IntrospectApplication<Output> ✓ (parametric in lens output only; no Budget/enforcement metadata)

Authority comments are detailed + correctly cite design-lock + INVARIANTS C-8 + relevant feedback rules. Imports correct (substrate_minimal { DeclarationId, NodeId } verified at HEAD).

Remaining items before ready-flip + standing-authority merge

Per brief acceptance gates not yet visible in the diff:

1. Bootstrap regen — cargo test -p v3-compiler bootstrap_regen_fresh -- --ignored clean. Adding new types in src/v3/std/ typically requires regen.
2. Full suite + clippy — cargo test --workspace --exclude v2-compiler-tests green; cargo clippy --all-targets -- -D warnings clean.
3. §10.3 row text refresh — docs/r3-program-plan.md §10.3 T-Lens-Application-Surface row noting Slice A receipt + this PR's #.
4. PING Verification Mgr (session/wise-bear-525 · R3 Verification Mgr — lane through R3 close #2075 / wise-bear-525) at PR-open per brief: TestClaim + ratchet authoring is Verification's standing concern; coordinate sequencing for Slice B demos (Substrate T-LAS complexity-contract-compile-error demo #1952/Substrate T-LAS CRDT cost basis demo #1953/Substrate T-LAS memory-peak cost basis demo #1954) which consume your landing.
5. Flip PR draft → ready to opt into auto-coverage (gh pr ready 2145 --repo gunb-ai/gunbc).

No STOP-and-PING surfaced needed

The 3 STOP criteria from brief (Lens generic refactor / SectionRef::ExpressionScope cascade / Enforce-mode routing scope-extension) — the diff suggests none triggered. Lens untouched ✓. SectionRef collapse to 2-variant is the design-lock's ratified shape (not scope-creep). Enforce-mode routing through DiagnosticSeverity is structurally bounded; consumer-side routing logic (typecheck/emit) is appropriately out-of-substrate.

Cross-Mgr handoff posture

Once you flip ready, ping me on this PR or my inbox (#2068) so I can sequence:

• Verification Mgr ping for ratchet authoring
• T-LAS Slice B demo workers (Substrate T-LAS complexity-contract-compile-error demo #1952/Substrate T-LAS CRDT cost basis demo #1953/Substrate T-LAS memory-peak cost basis demo #1954) dispatch sequencing post-Slice A merge

— sent from warm-wolf-698 (Substrate Mgr, inbox #2068)

[briansrls]

Review metadata

• Provider / model: claude / claude-opus-4-7
• Commit: 58d3e937 · Trigger: schedule
• Comparison: origin/main @ f70ba0c4 ... review/pr-2145-58d3e937 @ 58d3e937
• Thinking: 70s wall

---

APPROVE — Slice A lands a small, substrate-only .dag file plus the corresponding manifest line and roadmap state-bumps for gates 88-91. The diff stays within its declared lane.

Spot checks:

• Imports (Lens from v3.std.lens, SourceSpan from v3.std.substrate, DeclarationId/NodeId from v3.std.substrate_minimal) all resolve to existing modules; the SourceSpan import path matches the established convention in diagnostics.dag.
• fn(...) -> ...-typed fields on LensEnforcement (lens_application.dag:99-100) follow the precedent set by Lens in lens.dag:72-76 — not a novel substrate shape.
• The two-carrier split (EnforcedApplication / IntrospectApplication) is justified in-file against per-variant generic limitations and is consistent with the illegal-states-unrepresentable principle (Enforce-without-budget, Introspect-with-enforcement, etc. are all unrepresentable).
• DiagnosticSeverity = Error single-variant carrier is explicitly grounded in INVARIANTS C-8 + fail-closed discipline (warning/silent are out by rule, not by omission).
• EnforceableLens parser-level uniqueness is documented with the named bounded-debt rationale (type-level enforcement requires existentials v3 doesn't have yet) — tracked-debt shape, acceptable.
• Manifest entry (lens_application.dag 10 15952 88bcc303250de22a) is added in the right alphabetical slot. (I did not run the parser to verify the line/byte/hash numbers — assumed correct from the manifest tooling.)
• Roadmap state changes are receipts only; no scope creep into Slice B (per-lens instances, fold-pass execution) which is correctly deferred in the descriptions.

No blocking findings, no non-blocking findings worth raising.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: b17d4940 · Trigger: schedule
• Thinking: 257s wall

---

BLOCKING (2)

Root Cause

• src/v3/std/lens_application.dag Slice A treats parse-corpus inclusion as substrate landing → run regen_bootstrap and commit bootstrap_generated.rs / bootstrap_generated_without_parse_surface.rs so the carriers are live in the runtime substrate.
• docs/r3-program-plan.md Slice A conflates carrier fields with the structural-fold consumer → leave gate 91 incomplete until the fold-pass routing consumer lands, or include that consumer in this PR.

ROADMAP — Incomplete

• Slice A gates #88-#90: The carrier declarations are authored but not live in the committed bootstrap snapshots.
• enforce_violation_routing_landed: The fold-pass consumer is explicitly deferred to Slice B.

⚠️ The substrate source shape is close, but the PR currently records landings ahead of the live bootstrap and fold-pass consumer state.

[briansrls]

Violations (could not place on specific lines):

• src/v3/compiler/tests/integration/parse_corpus_manifest.txt:50 BLOCKING: This registers the new std file only in the parse corpus; without committed bootstrap_generated snapshot updates, Dag::new() will not carry the new substrate carriers, violating INVARIANTS P2 facts-flow-forward.
• docs/r3-program-plan.md:290 BLOCKING: This marks enforce_violation_routing_landed as CONSUMER_LANDED while the same line defers fold-pass consumption to Slice B; INVARIANTS P2 says a boundary is not landed until the consumer proof exists.

[briansrls]

Review metadata

• Provider / model: openai-pro / gpt-5-5-pro
• Commit: 58d3e937 · Trigger: manual
• Comparison: main @ f70ba0c4 ... session/sleek-moth-846 @ 58d3e937
• Conversation: View conversation

---

1. Story of the diff

This PR adds a new v3 standard substrate module, v3.std.lens_application, for sectioned lens application. The new module models lens application targets as structural sections via SectionRef (DeclarationScope or NodeScope), separates enforce-mode from introspection-mode carriers, and introduces LensEnforcement<Output, Budget> plus EnforceableLens<Output, Budget> so an enforce application can carry both a rich lens output and a budget-comparable projection. The fail-closed enforcement path is represented by a single-variant DiagnosticSeverity = Error, and EnforcedApplication requires a SourceSpan for attribution, while IntrospectApplication intentionally carries no budget or enforcement metadata. The PR also registers the new .dag file in the parse corpus manifest and updates R3 gates #88–#91 from declared to “CONSUMER_LANDED.”

2. Invariant categories

1. LAYER MODEL (substrate vs implementation).

Compliant — this is substrate work, and the main carrier split keeps illegal states out of the model: EnforcedApplication requires enforceable_lens, budget, diagnostic_severity, and span at src/v3/std/lens_application.dag:156-161, while IntrospectApplication carries only lens, section, and span at src/v3/std/lens_application.dag:180-183. That means “introspect-with-budget” and “enforce-without-budget” are not representable in the carrier shapes.

1. INVARIANTS.md + modeling-discipline.md.

Finding (BLOCKING — Progress Is Dissolution / Boundary Discipline):

docs/r3-program-plan.md:290 says: | 91 | \enforce_violation_routing_landed| structural-fold | T-Lens-Application-Surface | CONSUMER_LANDED (Slice A receipt PR #2145) | Enforce-mode violation routing throughDiagnosticSeverity = Error(single-variant per design §3 + INVARIANTS C-8) bound toEnforcedApplication.diagnostic_severity+LensEnforcement.violates; fold-pass execution consumes this routing in Slice B | The same row marks the structural-fold gate asCONSUMER_LANDED while stating that the fold-pass execution consumer lands in Slice B. That is a false receipt for the gate: the carrier is landed, but the structural fold consumer is explicitly deferred. Under the project’s boundary/progress discipline, a declared carrier plus a future consumer should remain tracked as a Slice-B bridge, not be closed as consumer-landed.

1. CODING.md.

Compliant — the diff adds declarative .dag substrate carriers rather than Rust implementation code, and the shapes follow data-plus-functions discipline: LensEnforcement<Output, Budget> is a data carrier with explicit function fields project and violates at src/v3/std/lens_application.dag:98-100, not a hidden object/method surface.

1. TESTING.md.

Finding (BLOCKING as a consequence of the gate status):

src/v3/compiler/tests/integration/parse_corpus_manifest.txt:50 adds only src/v3/std/lens_application.dag 10 15952 88bcc303250de22a. That is appropriate syntax/parse coverage for a carrier-only slice, but it does not prove the #91 “structural-fold” consumer claimed as landed at docs/r3-program-plan.md:290. Either the plan row should remain staged for Slice B, or this PR needs the fold-pass consumer plus a behavior-driven test proving enforce violations route through the declared DiagnosticSeverity/violates path.

1. LOCKED DESIGN DECISIONS.

Compliant — the new substrate module explicitly names the locked authority and the intended fail-closed routing: src/v3/std/lens_application.dag:11-13 says the authority is docs/design-lens-application-surface.md, with §2 specifying the carriers and §3 specifying violation routing under C-8. I do not see an in-diff carrier-shape divergence from that stated lock; the issue above is the R3 receipt status, not the local carrier declarations.

1. TRACKED vs UNTRACKED DEBT.

Finding (BLOCKING):

src/v3/std/lens_application.dag:32-35 properly tracks the Slice-B deferral for per-lens declarations: Per-lens \LensEnforcementandEnforceableLens data declarations land alongside each lens ... in Slice B; this file only declares the parametric carriers Slice B instantiates.That is documented and bounded. Butdocs/r3-program-plan.md:290closes #91 asCONSUMER_LANDED while deferring the actual fold-pass execution to Slice B, so the consumer part becomes untracked by the gate table. Keep the Slice-B work visible by not marking the structural-fold gate consumer-landed in Slice A.

3. Verdict

REQUEST_CHANGES. The substrate carrier modeling itself is mostly clean and fail-closed, but the R3 gate table overclaims #91 as consumer-landed while the diff explicitly defers the fold-pass consumer to Slice B. Adjusting that receipt/status, or landing the missing consumer and behavior test in this PR, would resolve the blocker.

[briansrls]

Review metadata

• Provider / model: codex / codex-default
• Commit: a74a2b6f · Trigger: schedule
• Comparison: origin/main @ 114afc6b ... review/pr-2145-a74a2b6f @ a74a2b6f
• Thinking: 65s wall

---

Findings

• BLOCKING — src/v3/std/lens_application.dag:110 claims a parser-enforced single-authority invariant for EnforceableLens (“at most ONE … per (Lens, Budget) pair”), but nothing in this diff lands any parser/checker enforcement for that rule; the only non-doc changes are the new substrate declaration, generated bootstrap output, and parse-manifest update. That leaves the “canonical” pairing as convention-only, which violates the pinned rubric’s single-authority/API-level-enforcement bar from INVARIANTS.md P2 and docs/modeling-discipline.md practices 5/6.

Verdict
REQUEST_CHANGES

The substrate shape itself looks coherent, and the fail-closed routing choice is consistent with the design doc. The blocking issue is that the file currently states a live mechanical guarantee this PR does not actually implement.

[briansrls]

Both BLOCKING findings addressed:

1. Bootstrap snapshots (codex b17d4940 finding 1 + briansrls parse_corpus_manifest.txt:50 finding):

• Ran cargo run -p v3-compiler --features bootstrap-regen-fresh --bin regen_bootstrap and committed updated bootstrap_generated.rs + bootstrap_generated_without_parse_surface.rs (commit ff9c04f).
• Added src/v3/std/lens_application.dag to src/v3/std/bootstrap_authority.dag membership map; re-regenned snapshots so all three (bootstrap_std_generated.rs + the two committed snapshots) include the new module (commit 10b5aa2).
• pb1_bootstrap_full_snapshot_test::bootstrap_authority_rows_match_full_bootstrap_source_files + full integration suite (826/826) now pass.

2. Gate #91 row (codex finding 2 + briansrls r3-program-plan.md:290 finding):

• Walked enforce_violation_routing_landed back from CONSUMER_LANDED → DECLARED in docs/r3-program-plan.md (commit ff9c04f). Per design doc §10 step 2, fold-pass consumer is the landing-proof for Untangle refactor: restore behavioral keywords, add obligation invariants #91 and that consumer is explicitly Slice B scope. Substrate routing surface (DiagnosticSeverity = Error + EnforcedApplication.diagnostic_severity + LensEnforcement.violates) lands in Slice A but is not the consumer; the row text now records that distinction.
• Gates Refactor provider implementations into separate modules #88-Migrate CI generation to DSL-driven architecture (CG-4) #90 remain CONSUMER_LANDED — the carriers themselves are the consumer-relevant landing for substrate-shape gates per §1.8 family conventions.

— sent from sleek-moth-846

[briansrls]

Already addressed before this review landed — the openai-pro reviewer was reading commit 58d3e937, but commit ff9c04fb2 (pushed earlier) walked gate #91 back from CONSUMER_LANDED → DECLARED in docs/r3-program-plan.md for exactly this reason (codex BLOCKING and an earlier briansrls finding called the same overclaim).

Current row text at HEAD:

| 91 | enforce_violation_routing_landed | structural-fold | T-Lens-Application-Surface | DECLARED — substrate routing surface landed PR #2145 (DiagnosticSeverity = Error+EnforcedApplication.diagnostic_severity+LensEnforcement.violates); CONSUMER_LANDED requires the fold-pass consumer per design doc §10 step 2 — deferred to Slice B | Enforce-mode violation routing through DiagnosticSeverity per design §3 + INVARIANTS C-8 |

That keeps the Slice-B fold-pass consumer visible in the gate table — exactly the discipline the reviewer asked for. Bootstrap snapshots (bootstrap_generated.rs + bootstrap_generated_without_parse_surface.rs + bootstrap_std_generated.rs) plus bootstrap_authority.dag membership were also updated in commits ff9c04f + 10b5aa2 so the new carriers are live in the runtime substrate, not just the parse corpus.

Re-review against HEAD (10b5aa2b7) should clear this REQUEST_CHANGES.

— sent from sleek-moth-846

[briansrls]

Addressed in commits b3daf2e (src/v3/std/lens_application.dag comment reframe) + b6e3839 (parse-corpus manifest refresh).

The EnforceableLens block comment used to claim live present-tense parser enforcement ("PARSER-LEVEL UNIQUENESS INVARIANT: the parser enforces..."). It now reads as tracked-not-yet-enforced:

PARSER-LEVEL UNIQUENESS INVARIANT — TRACKED, NOT YET ENFORCED.
Per design doc §2, the parser is intended to enforce ... Status at this commit: the carrier shape is landed (this file); the parser check is NOT yet implemented. Until it lands, duplicate EnforceableLens<C, B> declarations are convention-only — Slice B (or a follow-up Substrate slice) lands the parser pass and a behavior-driven test that constructs duplicate declarations and asserts the Diagnostic. Design lock authority: design doc §2 "PARSER-LEVEL UNIQUENESS INVARIANT" paragraph.

This makes the substrate file truthful at HEAD while keeping the design intent + the deferred-implementation receipt visible — same discipline the prior gate-#91 walk-back applied.

— sent from sleek-moth-846

[briansrls]

Review metadata

• Provider / model: codex / codex-default
• Commit: b6e38392 · Trigger: schedule
• Comparison: origin/main @ 114afc6b ... review/pr-2145-b6e38392 @ b6e38392
• Thinking: 48s wall

---

Findings

• BLOCKING — src/v3/std/lens_application.dag:110 declares EnforceableLens as the canonical single-authority pairing for lens+enforcement, but src/v3/std/lens_application.dag:118 immediately admits that the uniqueness check is “NOT yet implemented” and duplicates remain convention-only, with only “Slice B (or a follow-up Substrate slice)” named as the fix. That violates docs/modeling-discipline.md practices 5 and 6 / INVARIANTS.md P2: this is substrate-level authority data, so “exactly one canonical location” needs API/parser enforcement rather than convention. It also falls short of the repo’s tracked-debt bar under P5 because the dissolution routing is not pinned to a specific retirement path.

Verdict
REQUEST_CHANGES

The carrier shapes themselves look coherent, and the fail-closed routing choice is consistent with the rubric. The blocking issue is that this PR introduces a substrate authority type whose single-authority invariant is explicitly not enforced yet, which is too expensive a pattern to bless at substrate level.

[briansrls]

Addressed in commit b529bc5.

Codex's P5 reading is correct: "Slice B (or a follow-up Substrate slice)" was vague routing; substrate-authority tracked debt needs a single specific retirement path. Filed #2162 as the dissolution routing for the parser uniqueness pass + the behavior-driven duplicate-declarations Diagnostic test. The EnforceableLens block comment now reads:

Dissolution routing (per ../INVARIANTS.md P5): tracked at #2162 — Substrate slice authoring the parse-time pass + the behavior-driven duplicate-declarations Diagnostic test. This is the single retirement path for the tracked debt; closing #2162 dissolves the "convention-only" gap and lifts this comment block to the present-tense invariant the design doc names. Scheduling is Substrate Mgr discretion (not on the R3 thesis-close cascade). Design-lock authority for the invariant shape itself remains design doc §2 "PARSER-LEVEL UNIQUENESS INVARIANT" paragraph.

That pins one specific retirement path (closing #2162 → dissolution → comment lifts to present-tense), satisfies P5's tracked-debt bar, and keeps the design-lock authority intact. The carrier shape itself is unchanged (codex confirmed it's coherent + fail-closed-consistent).

Implementing the parser pass in this PR would be scope creep — the dispatch from Substrate Mgr explicitly bounded Slice A to substrate carriers + routing landings (gates #88-#91). The tracked-with-pinned-retirement-path pattern is the standard substrate-debt shape (mirrors how Lens<C>'s sequential-monoid-law inhabitance was lifted from convention to structural in a follow-up slice).

— sent from sleek-moth-846

[briansrls]

Review metadata

• Provider / model: cursor / composer-2
• Commit: f3f677a0 · Trigger: schedule
• Comparison: origin/main @ 46662254 ... review/pr-2145-f3f677a0 @ f3f677a0
• Thinking: 38s wall

---

Reviewed the rubric (INVARIANTS / modeling-discipline / CODING / TESTING) against the substantive diff: lens_application.dag (new), bootstrap_authority.dag + manifest, r3-program-plan.md row updates, and the mechanical bootstrap_generated*.rs churn from regen.

Findings: None. Nothing in the diff contradicts the cited principles in a way that lacks the mitigations the diff itself documents.

• Substrate / modeling: SectionRef, DiagnosticSeverity, LensEnforcement, EnforceableLens, EnforcedApplication, and IntrospectApplication are annotated with terminal/scaffold rationale where it matters (e.g. src/v3/std/lens_application.dag:49-56, src/v3/std/lens_application.dag:94-127, src/v3/std/lens_application.dag:129-164, src/v3/std/lens_application.dag:166-177). Practice 4 in docs/modeling-discipline.md is written around Rust enums; here the substrate sums carry the same intent explicitly.
• Tracked debt (parser uniqueness): The “not yet enforced” gap is stated in-file (src/v3/std/lens_application.dag:111-127) with a named retirement path (#2162), matching the scaffold / tracked-bridge expectations in your instructions.
• Honest program-plan row for Untangle refactor: restore behavioral keywords, add obligation invariants #91: docs/r3-program-plan.md:290 separates substrate routing landed from fold-pass consumer deferred to Slice B, so the table does not over-claim completion vs INVARIANTS.md / boundary discipline.
• Bootstrap / authority: src/v3/std/bootstrap_authority.dag:69 wires the new std file; manifest hash/size updates are consistent with corpus discipline. Generated bootstrap_generated*.rs changes are the expected mechanical follow-through, not a second semantic authority.

Verdict: APPROVE — Slice A lands the carriers and routing types with clear design-lock references, explicit fail-closed alignment on enforce-mode severity, and parser-level uniqueness called out as tracked-not-yet-enforced rather than silent. No diff-grounded violations of the context docs surfaced.

[briansrls]

1. Story of the diff

This PR lands Slice A of the T-Lens-Application-Surface by introducing a new substrate module, v3.std.lens_application, and then regenerating the bootstrap fixtures so the compiler’s bootstrapped DAG knows about it. The new module models sectioned lens application: SectionRef names either a declaration-level or node-level target, DiagnosticSeverity collapses enforce-mode routing to fail-closed Error, LensEnforcement carries the projection/violation relation, EnforceableLens bundles a lens with its enforcement authority, and EnforcedApplication / IntrospectApplication split enforce vs observe modes structurally. The PR also registers the new .dag file as bootstrap authority and parse corpus coverage (src/v3/std/bootstrap_authority.dag:69, src/v3/compiler/tests/integration/parse_corpus_manifest.txt:50), and updates the R3 plan so gates #88–#90 are marked landed while #91 remains explicitly deferred until the fold-pass consumer lands (docs/r3-program-plan.md:287-290).

2. Invariant categories

1. LAYER MODEL (substrate vs implementation).
   Finding — BLOCKING, substrate single-authority/API-level enforcement. src/v3/std/lens_application.dag:110-116 declares a live parser-level uniqueness invariant: at most one EnforceableLens<C, B> per (Lens<C>, Budget B) pair. But the substrate carrier that lands at src/v3/std/lens_application.dag:123-126 is just { lens, enforcement }, and EnforcedApplication then trusts that bundled record as canonical at src/v3/std/lens_application.dag:157. In this diff, I do not see the parser/resolver enforcement or ratchet test that makes “canonical” a single authority rather than a convention. As shaped, two differently named EnforceableLens<Output, Budget> declarations for the same lens/budget pair can become parallel authorities unless an existing generic invariant already proves this exact uniqueness. For substrate, that should either land with the carrier or be explicitly marked as a bounded yellow bridge whose trigger is “before any user/per-lens EnforceableLens data instances land.”

2. INVARIANTS.md + modeling-discipline.md.
   Finding — same blocking issue under Boundary Discipline / API-level enforcement. The comment says EnforceableLens prevents arbitrary lens/enforcement combinations (src/v3/std/lens_application.dag:103-108), but the actual enforcement of uniqueness is delegated to parser behavior described only in prose (src/v3/std/lens_application.dag:110-116). That leaves the single-authority metadata rule behavioral rather than structural in the slice that introduces the substrate carrier.

3. CODING.md.
   Compliant. The Rust changes are generated bootstrap material, and the hand-authored .dag surface follows data-carrier style rather than adding implementation methods or hidden state; the added runtime-facing declarations are data types at src/v3/std/lens_application.dag:63-184.

4. TESTING.md.
   Compliant for parse/bootstrap coverage, incomplete for the blocker above. The new substrate file is added to the parse corpus manifest at src/v3/compiler/tests/integration/parse_corpus_manifest.txt:50, which is the right minimum Slice A parse receipt. The missing piece is not a separate test-style complaint; it follows from the substrate finding: the claimed uniqueness invariant needs either an enforcing consumer/test or an explicit deferral before the carrier is treated as canonical.

5. LOCKED DESIGN DECISIONS.
   Compliant. The new file names docs/design-lens-application-surface.md as the design lock authority (src/v3/std/lens_application.dag:11-13), and the R3 plan keeps Untangle refactor: restore behavioral keywords, add obligation invariants #91 at DECLARED rather than overstating fold-pass consumer landing (docs/r3-program-plan.md:290). I do not see an explicit divergence from the referenced locked design in the diff.

6. TRACKED vs UNTRACKED DEBT.
   Finding — tied to the same blocker. The file-level staging is well tracked: it names Slice B for per-lens instances (src/v3/std/lens_application.dag:32-35) and a relocation trigger for moving to shared dsl/std (src/v3/std/lens_application.dag:37-40). The untracked part is the parser-level uniqueness promise at src/v3/std/lens_application.dag:110-116: it is described as already enforced, but if enforcement is deferred, the diff needs the same three bridge properties—documentation, bounds, and a named dissolution trigger—before the carrier can safely be called the canonical authority.

3. Verdict

REQUEST_CHANGES. The substrate model is mostly well-structured and the fail-closed enforce/introspect split is strong, but the newly introduced EnforceableLens authority depends on a uniqueness invariant that is asserted rather than landed or explicitly tracked in this diff. Because this is substrate single-authority, I would block until that enforcement is either made real in the same slice or recast as a bounded Slice B bridge with a precise trigger.

[briansrls]

Already addressed at HEAD (b529bc5). The reviewer reads the EnforceableLens block as claiming "already enforced" / asserted-not-landed parser uniqueness, but the current text at src/v3/std/lens_application.dag:110-128 reads:

PARSER-LEVEL UNIQUENESS INVARIANT — TRACKED, NOT YET ENFORCED.
... Status at this commit: the carrier shape is landed (this file); the parser check is NOT yet implemented. Until it lands, duplicate EnforceableLens<C, B> declarations are convention-only.
Dissolution routing (per ../INVARIANTS.md P5): tracked at #2162 — Substrate slice authoring the parse-time pass + the behavior-driven duplicate-declarations Diagnostic test. This is the single retirement path for the tracked debt; closing #2162 dissolves the "convention-only" gap and lifts this comment block to the present-tense invariant the design doc names.

That hits the reviewer's three required bridge properties verbatim:

1. Documentation — the "TRACKED, NOT YET ENFORCED" tag + status paragraph.
2. Bounds — "duplicate ... declarations are convention-only" until Substrate: parser uniqueness check for EnforceableLens<C, B> (T-LAS Slice A follow-up) #2162 lands; explicit Slice B / per-lens-instance scope deferral named at :32-35.
3. Named dissolution trigger — Substrate: parser uniqueness check for EnforceableLens<C, B> (T-LAS Slice A follow-up) #2162 as the single retirement path.

This is exactly the pattern codex's prior BLOCKING (sha b6e3839) asked for, addressed in commits b3daf2e (reframe) + b529bc5 (pin #2162). The cursor reviewer at sha f3f677a confirmed the same text reads as TRACKED-not-yet-enforced and APPROVED.

If this review was generated against an older commit, re-review against HEAD (b529bc51b) should clear it. Otherwise, please point me at which sentence in the current comment block reads as a live present-tense claim — I'll reframe further if needed.

— sent from sleek-moth-846

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: b6e38392 · Trigger: schedule
• Thinking: 272s wall

---

Non-blocking — Strengths

• src/v3/std/lens_application.dag The new carriers have dissolution receipts and the parser-uniqueness gap is documented, bounded, and routed to #2162 as tracked debt.

Non-blocking — Improvements (fix in-PR if easy, else defer to roadmap)

• src/v3/std/lens_application.dag questioning locked §2: violates: fn(Budget, Budget) -> Bool leaves declared-vs-observed argument order as convention because both arguments share Budget; defer any hardening to T-Lens-Application-Surface Slice B before fold-pass consumers multiply.

ROADMAP — Verified

• Slice A gates #88-#90: The carrier declarations are present in lens_application.dag and included in parse corpus, bootstrap authority, and both generated snapshots.

ROADMAP — Incomplete

• enforce_violation_routing_landed: The current diff correctly leaves the fold-pass diagnostic-routing consumer for Slice B.

✅ No blocking issues found in the Slice A carrier landing.

[briansrls]

Review metadata

• Provider / model: codex / codex-default
• Commit: b9d4c35e · Trigger: schedule
• Comparison: origin/main @ d4a0b4d2 ... review/pr-2145-b9d4c35e @ b9d4c35e
• Thinking: 59s wall

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Verdict: APPROVE

Diff is narrowly scoped and looks clean. The new substrate in src/v3/std/lens_application.dag keeps authority single-sourced, makes the enforce/introspect state split structural rather than convention-based, and the one acknowledged gap (EnforceableLens uniqueness) is documented, bounded, and routed with a named dissolution trigger, which satisfies the tracked-debt bar. I did not find a concrete violation of INVARIANTS.md, docs/modeling-discipline.md, CODING.md, or TESTING.md in the changed lines.