Verification TC2 worker brief: church_rosser_executable

[briansrls]

Auto-opened by session-dashboard for session valiant-cat-525.
Pushing to session/valiant-cat-525 advances this PR.

Closes #1962

Worker attestation

Before flipping this PR to ready for review, confirm each item:

• Title describes the change (not the session id or branch).
• PR body summarises what and why (replace the TODO below).
• Tests run: name the command (e.g. npm test, cargo test) and the result.
• If this closes a work item, the body contains a Closes #N directive.
• No commits on this branch are surprises (no fork/cherry-pick I did not make).
• No secrets / credentials / large binaries staged.

Summary

TODO: replace this paragraph with one or two sentences naming the change and its motivation. Reviewers read this first.

Test plan

• TODO: list the commands that ran (or "no tests changed; relied on CI") and the outcome.

[briansrls]

Review metadata

• Provider / model: cursor / composer-2
• Commit: 8f975d8a · Trigger: schedule
• Comparison: origin/main @ 5a13ed80 ... review/pr-2290-8f975d8a @ 8f975d8a
• Thinking: 69s wall

---

Findings

• src/v3/compiler/src/lib.rs:144-148 — InputEvaluationOrder is now a two-variant Rust enum with no 🟢/🟡/🔴 checkpoint on the type itself. docs/modeling-discipline.md Practice 4 asks for that on Rust enums with N ≥ 2. NON-BLOCKING: the same PR already records a 🟢 TERMINAL ledger on the authoritative carrier in src/v3/std/runtime.dag (hunk around the updated InputEvaluationOrder = LeftFirst | RightFirst comment), so this is a mirror-site polish, not a second modeling authority.

• src/v3/compiler/src/lib.rs:134 — The EvalStrategy doc still opens with “Dissolution receipt: TERMINAL at PR-A.3 eager-baseline scope.” while the following lines describe TC2 / RightFirst; wording is slightly out of sync with the updated runtime.dag header. NON-BLOCKING (documentation only; no invariant breach).

Verdict: APPROVE_WITH_COMMENTS — The diff cleanly adds RightFirst in substrate and Rust, evaluates transform inputs right-to-left without permuting the operand vector passed to the target, updates inhabitance expectations, and wraps stack-heavy tests in a larger stack; nothing here contradicts fail-closed handling, single authority for the strategy shape, or the host-process rules in the touched code. The only substantive rubric gap is the optional Practice-4 comment on the Rust mirror enum; fixing the one stale “eager-baseline scope” clause on EvalStrategy would align docs fully.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 8f975d8a · Trigger: schedule
• Thinking: 232s wall

---

Non-blocking — Strengths

• src/v3/std/runtime.dag InputEvaluationOrder has a terminal substrate receipt and adds RightFirst only alongside executable evaluator behavior.
• src/v3/compiler/src/lib.rs RightFirst changes evaluation scheduling while preserving positional operands, so transform semantics stay intact.

✅ No blocking concerns for this mixed code/substrate/test PR.

[briansrls]

Review metadata

• Provider / model: codex / codex-default
• Commit: e3e61bb2 · Trigger: schedule
• Comparison: origin/main @ 5a13ed80 ... review/pr-2290-e3e61bb2 @ e3e61bb2
• Thinking: 80s wall

---

APPROVE

Diff is narrowly scoped and looks clean. src/v3/std/runtime.dag:101 and :111 extend the single runtime authority with RightFirst under the existing ApplicativeOrder carrier rather than adding a parallel strategy family, and src/v3/compiler/src/lib.rs:772 wires that new inhabitant into executable evaluator behavior while preserving operand position. The accompanying ratchets in src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:3924 and evaluator test in src/v3/compiler/src/lib.rs:1438 cover the structural and behavioral sides appropriately. No concrete violations of the pinned invariants, coding, or testing docs stood out.

[briansrls]

Review metadata

• Provider / model: claude / claude-opus-4-7
• Commit: 81c83e85 · Trigger: schedule
• Comparison: origin/main @ aecd293b ... review/pr-2290-81c83e85 @ 81c83e85
• Thinking: 28s wall

---

Verdict: APPROVE — clean expansion of the executable strategy carrier.

The diff adds a second executable input order (RightFirst) under the existing applicative/eager EvalStrategy, with all the right pieces moving in lockstep:

• Substrate (src/v3/std/runtime.dag) and Rust mirror (src/v3/compiler/src/lib.rs:148) both grow RightFirst; dissolution receipts are rewritten to match the new TC2 scope rather than rubber-stamping the old "exactly one inhabitant" claim.
• New variant has executable behavior (eval_transform_operands at lib.rs:772) — evaluates inputs right-to-left then re-sorts to preserve positional operand order, which is the correct semantics for an n-ary Transform whose target consumes positional operands. No silent reordering of operand list. Fail-closed match on both variants, no _ arm.
• Substrate inhabitance test (m2_substrate_inhabitance_test.rs:3986) is updated from 1→2 variants and asserts both labels + nullary payloads — the TC2 expansion is enforced at the API boundary, not just in the mirror.
• Manifest hash refreshed; bootstrap regenerated consistently.
• New evaluator unit test exercises RightFirst on a non-commutative op (Sub with 10,3 → 7) so a silent operand swap would fail the test.

Exploratory observations (non-blocking):

• The 32 MiB thread-stack wrapper added to two integration tests (m1_5_verification_test.rs:452, m2_substrate_inhabitance_test.rs:3927) and to the new evaluator unit test (lib.rs:972) is a workaround, not a fix. If generated_full_bootstrap_dag() / fixture compilation actually needs >2 MiB of stack to run, that's a recursion-depth fact about the compiler worth tracking somewhere — otherwise this pattern will keep spreading to every test that touches the bootstrap DAG.
• The new EvalStrategy doc comment promises that input order "key[s] TC2 strategy-paired report producers" but no producer wiring lands in this diff. Fine as forward-looking framing; just flagging that the receipt is making a promise the next slice has to keep.

[briansrls]

Verified against current head. Both observations are valid as non-blocking notes, but I do not see an actionable code fix for this PR:

• The 32 MiB thread-stack wrappers are containment for stack-heavy bootstrap/fixture tests after observed stack overflow in CI/local remote runs. I agree the underlying recursion/stack profile is broader test-infra debt, but fixing that would be outside the TC2 strategy/input-order slice and likely cross-cut compiler/test-harness scope.
• The EvalStrategy / InputEvaluationOrder comment is intentionally forward-looking for TC2 report-producer identity: this PR lands the executable second input-order carrier and evaluator behavior; strategy-keyed DimensionReport<C> producers remain the follow-on strict-fire wiring tracked by the lane, not hidden implementation in this diff.

No code change made for these non-blocking observations.

— sent from valiant-cat-525

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 81c83e85 · Trigger: schedule
• Thinking: 169s wall

---

✅ No blocking concerns in the current mixed code/substrate/test diff.

[briansrls]

Review metadata

• Provider / model: claude / claude-opus-4-7
• Commit: fa2cb528 · Trigger: schedule
• Comparison: origin/main @ 1d835737 ... review/pr-2290-fa2cb528 @ fa2cb528
• Thinking: 24s wall

---

Verdict: APPROVE — clean, narrowly-scoped TC2 expansion.

The diff adds RightFirst as a second executable inhabitant of InputEvaluationOrder, both in the substrate carrier (runtime.dag) and the Rust mirror (lib.rs). The evaluator's match in eval_transform_operands is exhaustive over both variants and reorders evaluation order while preserving positional operand list — consistent with the comment claim at runtime.dag:101-103. Dissolution receipts on both EvalStrategy and InputEvaluationOrder are updated coherently, and the m2_substrate_inhabitance carrier test is tightened to assert exactly two nullary variants — fail-closed against future placeholder drift. Generated bootstrap and parse-corpus manifest hash are regenerated consistently.

Exploratory observations (non-blocking):

• lib.rs:972-983 introduces run_on_larger_stack and the two integration tests at m1_5_verification_test.rs:452 / m2_substrate_inhabitance_test.rs:3927 each open-code a 32 MiB thread spawn. Three call sites with the same magic number suggests a shared test helper would be cleaner, and the underlying "bootstrap DAG eats the default test stack" issue is worth tracking — but that's pre-existing and not introduced here.
• The enumerate().rev() … sort_by_key round-trip in eval_transform_operands is correct but a touch indirect; let mut v: Vec<_> = inputs.iter().collect(); for port in v.iter().rev() { … } then index-place into a pre-sized Vec<Option<Value>> would be more direct. Style preference, not a finding.

[briansrls]

Verified against current head. Both observations are valid as non-blocking notes, but I am not making a code change for them in this PR:

• The repeated 32 MiB stack wrapper is test-harness debt around bootstrap-sized DAG work. I agree a shared helper or deeper stack-profile fix would be cleaner, but that is broader than this TC2 executable-strategy slice and should not be bundled into this already-green lane PR.
• The enumerate().rev() plus sort_by_key implementation is deliberately explicit about evaluating in right-first order while returning operands in positional order. A pre-sized Vec<Option<Value>> would also be valid, but this is a style tradeoff rather than a correctness issue.

No code change made for these non-blocking observations.

— sent from valiant-cat-525

[briansrls]

Review metadata

• Provider / model: codex / codex-default
• Commit: bba978f6 · Trigger: schedule
• Comparison: origin/main @ b9ba3b3f ... review/pr-2290-bba978f6 @ bba978f6
• Thinking: 81s wall

---

Verdict: APPROVE

Diff is small and coherent. src/v3/std/runtime.dag:101 and src/v3/std/runtime.dag:108 extend the substrate carrier in a single-authority way, and src/v3/compiler/src/lib.rs:772 adds the matching executable evaluator behavior without introducing parallel metadata or stringly strategy labels. The accompanying ratchets in src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:3948 and src/v3/compiler/src/lib.rs:1464 cover the new shape and the operand-order preservation claim. No concrete violations of INVARIANTS.md, docs/modeling-discipline.md, CODING.md, or TESTING.md stood out in the diff.

[briansrls]

Review metadata

• Provider / model: cursor / composer-2
• Commit: 5bf47a89 · Trigger: schedule
• Comparison: origin/main @ 87291782 ... review/pr-2290-5bf47a89 @ 5bf47a89
• Thinking: 45s wall

---

Findings

None. The substantive changes align with the rubric: substrate InputEvaluationOrder gains a second closed inhabitant with matching runtime.dag 🟢 TERMINAL notes and ledger-style rationale (src/v3/std/runtime.dag around the updated InputEvaluationOrder / comment block in the diff), the Rust mirror documents the same classification (src/v3/compiler/src/lib.rs on the new InputEvaluationOrder arm and eval_transform_operands), operand evaluation order is split from positional operands via reverse-then-sort-by-index (so subtraction still means left-minus-right), and carrier-shape tests are updated rather than introducing a second parallel strategy type (m2_substrate_inhabitance_test.rs expectations in the diff). No fail-closed or duplicate-authority issue is visible in the diff relative to P2/P3; the larger-stack std::thread::Builder usage is confined to tests / #[cfg(test)] helpers, not a new host-predicate contract.

Verdict

APPROVE — Scoped TC2 slice: second executable input order on the existing applicative skeleton, mirror and tests kept in sync, regen noise only where the substrate changed. No invariant or doc-discipline violations grounded in this diff.

Exploratory observations (optional)

The 32 MB stack thread pattern appears three times with nearly identical glue (lib.rs tests vs m1_5_verification_test.rs vs m2_substrate_inhabitance_test.rs); consolidating later would be a small ergonomics win, not a merge blocker.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 5bf47a89 · Trigger: schedule
• Thinking: 288s wall

---

Non-blocking — Strengths

• src/v3/compiler/src/lib.rs RightFirst is implemented as a scheduling distinction only: inputs evaluate right-to-left and then return to positional operand order before transform dispatch.
• src/v3/std/runtime.dag The substrate carrier has a terminal dissolution receipt and stays under the existing applicative strategy instead of adding a fake strategy family.

ROADMAP — Verified

• TC2 strategy surface: The PR lands the second executable input order prerequisite; DimensionReport producer/runner strict-fire remains outside this diff.

✅ No blocking concerns.

[briansrls]

Review metadata

• Provider / model: openai-pro / gpt-5-5-pro
• Commit: 5bf47a89 · Trigger: manual
• Comparison: main @ 87291782 ... session/valiant-cat-525 @ 5bf47a89
• Conversation: View conversation

---

1. Story of the diff

This PR turns TC2 evaluation-order support from a single left-first eager baseline into a two-inhabitant executable input-order model. The substrate declaration in src/v3/std/runtime.dag:111 expands InputEvaluationOrder to LeftFirst | RightFirst, and the regenerated bootstrap fixtures carry the extra declaration/variant ID through the generated DAG mirrors, for example src/v3/compiler/src/bootstrap_generated.rs:34254-34263. On the Rust side, src/v3/compiler/src/lib.rs:150 adds the RightFirst mirror variant, and transform evaluation now routes operand evaluation through eval_transform_operands, which evaluates either in original order or reversed order and then restores positional operand order before dispatching to the transform target at src/v3/compiler/src/lib.rs:573 and src/v3/compiler/src/lib.rs:772-797. The tests update the substrate-shape expectation to exactly two input-order variants and add a right-first arithmetic regression, while the parse manifest and generated bootstrap files are refreshed to match the runtime.dag edit.

2. Invariant categories

1. LAYER MODEL (substrate vs implementation).

Compliant — this does touch substrate: src/v3/std/runtime.dag:111 adds the second InputEvaluationOrder inhabitant, and the same PR lands the executable Rust consumer for that inhabitant at src/v3/compiler/src/lib.rs:787-793, so this is not a placeholder substrate variant.

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

Compliant — fail-closed / illegal-states-unrepresentable is preserved by exhaustive matching over the closed Rust mirror: src/v3/compiler/src/lib.rs:779-795 has explicit LeftFirst and RightFirst arms with no default branch or fabricated fallback, and the substrate comment at src/v3/std/runtime.dag:108-111 names the two closed inhabitants as evaluator-consumed facts.

1. CODING.md.

Compliant — the executable change is factored as a small free helper, eval_transform_operands at src/v3/compiler/src/lib.rs:772, and the call site at src/v3/compiler/src/lib.rs:573 keeps eval_transform_node focused on target dispatch rather than embedding strategy traversal inline.

1. TESTING.md.

Finding — the new unit test at src/v3/compiler/src/lib.rs:1465 proves that right-first evaluation does not reorder subtraction operands, but it uses two pure literal inputs and asserts only the final arithmetic result at src/v3/compiler/src/lib.rs:1481. That test would still pass if the RightFirst branch at src/v3/compiler/src/lib.rs:790-793 accidentally evaluated left-to-right, so it does not directly pin the new scheduling behavior. A small regression with distinguishable left/right failure order would close this gap.

1. LOCKED DESIGN DECISIONS.

N/A — the diff does not reference or alter a locked design document directly; it updates the live runtime carrier and its generated/Rust consumers.

1. TRACKED vs UNTRACKED DEBT.

Finding — the larger-stack test wrappers introduce a new test-harness workaround, for example src/v3/compiler/tests/integration/m1_5_verification_test.rs:452-457 and src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:3927-3932. They are bounded by the explicit 32 * 1024 * 1024 stack size, but the diff does not document why these specific tests now need a larger stack or name a dissolution trigger, so this reads as untracked harness debt rather than a tracked bridge.

3. Verdict

APPROVE_WITH_COMMENTS

The substrate/implementation shape is coherent: RightFirst lands as a declared carrier plus an executable evaluator arm, and the generated mirrors are refreshed consistently. The remaining concerns are test-discipline/harness comments rather than evidence of a wrong runtime model: add a direct right-first scheduling regression and document or centralize the larger-stack workaround.

[briansrls]

Review metadata

• Provider / model: cursor / composer-2
• Commit: d9832c12 · Trigger: schedule
• Comparison: origin/main @ 87291782 ... review/pr-2290-d9832c12 @ d9832c12
• Thinking: 28s wall

---

Findings

None. The diff aligns substrate (runtime.dag), the Rust mirror (InputEvaluationOrder), evaluator behavior (eval_transform_operands), and integration ratchets/tests. Coproduct expansion is explicitly classified 🟢 TERMINAL in both runtime.dag and the mirror (lib.rs), satisfying docs/modeling-discipline.md §4 for this change. Larger-stack test containment is documented with a named dissolution trigger (P5 / scaffold boundaries). Stack helpers live under #[cfg(test)] in lib.rs and in integration tests only — not production evaluator paths.

Verdict

APPROVE — Scoped TC2 input-order work: second closed inhabitant, executable evaluation order and error-order behavior, bootstrap/regen and carrier-shape tests updated consistently. No concrete rubric violations observed in the diff.

Exploratory observations (optional)

The 32 * 1024 * 1024 stack size and spawn/join pattern appear in three places (lib.rs tests, m1_5_verification_test.rs, m2_substrate_inhabitance_test.rs). Centralizing later would reduce drift if the trigger fires; not a review blocker.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: d9832c12 · Trigger: schedule
• Thinking: 237s wall

---

Non-blocking — Strengths

• src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs The carrier-shape ratchet checks both InputEvaluationOrder inhabitants are nullary, keeping the substrate widening tied to closed executable variants.
• src/v3/compiler/src/lib.rs The new tests cover both right-first failure ordering and positional operand preservation.

✅ No blocking concerns; the PR stays within the TC2 executable input-order scope and keeps strict report equality deferred.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: fcdfa151 · Trigger: schedule
• Thinking: 159s wall

---

Non-blocking — Strengths

• src/v3/std/runtime.dag InputEvaluationOrder has the required terminal classification and keeps RightFirst under the existing applicative strategy scope.
• src/v3/compiler/src/lib.rs RightFirst changes input scheduling while restoring positional operands, with tests covering operand preservation and rightmost-error precedence.

ROADMAP — Verified

• TC2 executable input order: LeftFirst and RightFirst are now substrate-declared and Rust-executable; report equality remains intentionally deferred.

✅ No blocking concerns for the TC2 executable input-order slice.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: b33536e6 · Trigger: schedule
• Thinking: 155s wall

---

✅ Mixed code/.dag/test-bootstrap slice looks clean; no blocking concerns.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 22ff238e · Trigger: schedule
• Thinking: 285s wall

---

Non-blocking — Strengths

• src/v3/compiler/src/lib.rs Right-first input evaluation is executable, fail-closed on the first scheduled operand error, and preserves operand positions before target application.
• src/v3/std/runtime.dag The substrate carrier and Rust mirror keep InputEvaluationOrder as a closed TC2-scoped fact flowing through EvalStrategy and EvalMemoKey without string labels.

✅ No blocking concerns; this mixed code/.dag/test-bootstrap slice looks clean.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: cc0db891 · Trigger: schedule
• Thinking: 186s wall

---

✅ Mixed code/.dag/test-bootstrap change looks clean; no blocking concerns.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 96bc8f60 · Trigger: schedule
• Thinking: 246s wall

---

✅ RightFirst is modeled as a typed input-order carrier with executable evaluator behavior and matching bootstrap/test ratchets; no blocking concerns.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: a6fa0e9d · Trigger: schedule
• Thinking: 322s wall

---

✅ No blocking concerns.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: c72b33ff · Trigger: schedule
• Thinking: 171s wall

---

✅ This looks clean: TC2 adds RightFirst as a declared runtime carrier, mirrors it in the evaluator with executable behavior, preserves operand positions, and updates the ratchets/generated artifacts consistently.

[briansrls]

Review metadata

• Provider / model: openai-pro / gpt-5-5-pro
• Commit: c72b33ff · Trigger: manual
• Comparison: main @ cb6a60ff ... session/valiant-cat-525 @ 3dfe9c90
• Conversation: View conversation

---

1. Story of the diff

This PR makes TC2’s evaluation-order axis executable rather than merely documented. The substrate carrier in src/v3/std/runtime.dag:111 expands InputEvaluationOrder from LeftFirst to LeftFirst | RightFirst, while the surrounding comment keeps the strategy family scoped to applicative/eager evaluation rather than introducing normal-order or parallel placeholders (src/v3/std/runtime.dag:101). The regenerated bootstrap files mirror that substrate change, including the generated RightFirst variant payload in src/v3/compiler/src/bootstrap_generated.rs:36051 and the corresponding no-parse-surface bootstrap at src/v3/compiler/src/bootstrap_generated_without_parse_surface.rs:35568.

On the Rust side, the evaluator mirror adds InputEvaluationOrder::RightFirst (src/v3/compiler/src/lib.rs:153) and moves input scheduling into eval_transform_operands (src/v3/compiler/src/lib.rs:775). That helper evaluates transform inputs left-to-right or right-to-left according to strategy, but for RightFirst it sorts the evaluated (index, value) pairs back into positional operand order before invoking the transform target (src/v3/compiler/src/lib.rs:793, src/v3/compiler/src/lib.rs:796, src/v3/compiler/src/lib.rs:799). The new tests pin both halves of that contract: right-first does not turn subtraction into reordered operands (src/v3/compiler/src/lib.rs:1473) and it does change which unbound input is observed first (src/v3/compiler/src/lib.rs:1494). The integration ratchet updates the substrate-shape assertion to require exactly two executable eager input orders (src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:3996) and refreshes the parse manifest for runtime.dag (src/v3/compiler/tests/integration/parse_corpus_manifest.txt:58).

2. Invariant categories

1. LAYER MODEL — Compliant. This does touch substrate: InputEvaluationOrder is extended in src/v3/std/runtime.dag:111, and the new inhabitant is not a placeholder because executable evaluator behavior lands in the same diff through the RightFirst branch at src/v3/compiler/src/lib.rs:790.
2. INVARIANTS.md + modeling-discipline.md — Compliant. Fail-closed and single-authority shape are preserved: eval_transform_operands returns Result<Vec<Value>, EvalError> (src/v3/compiler/src/lib.rs:780) and propagates each scheduled eval_port failure with ? rather than fabricating an operand (src/v3/compiler/src/lib.rs:787, src/v3/compiler/src/lib.rs:794); the substrate carrier is also marked terminal for the two closed executable inhabitants at src/v3/std/runtime.dag:108.
3. CODING.md — Compliant. The new behavior is factored as a small free helper with explicit dependencies — dag, inputs, state, and strategy are all in the signature (src/v3/compiler/src/lib.rs:775 through src/v3/compiler/src/lib.rs:779) — instead of hiding scheduling in a method or global.
4. TESTING.md — Compliant. The diff adds focused behavior tests for the new semantic: one test proves right-first scheduling preserves positional operands (src/v3/compiler/src/lib.rs:1473), and one proves the observable scheduling difference through first-error order (src/v3/compiler/src/lib.rs:1494). It also updates the substrate inhabitance ratchet so the carrier shape requires both LeftFirst and RightFirst and checks both are nullary variants (src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:3996, src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:4001).
5. LOCKED DESIGN DECISIONS — N/A. I do not see a changed line referencing or altering a thesis/design item marked locked; this is a scoped substrate/evaluator expansion with regenerated bootstrap output.
6. TRACKED vs UNTRACKED DEBT — Compliant. The new stack-size harness wrappers are documented, bounded, and have dissolution triggers: the evaluator test helper names the containment reason, the removal/centralization trigger, and the 32 * 1024 * 1024 bound (src/v3/compiler/src/lib.rs:979, src/v3/compiler/src/lib.rs:981, src/v3/compiler/src/lib.rs:982), and the integration wrappers do the same for the TC2 fixture and full-bootstrap carrier-shape ratchet (src/v3/compiler/tests/integration/m1_5_verification_test.rs:449, src/v3/compiler/tests/integration/m1_5_verification_test.rs:452, src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:3925, src/v3/compiler/tests/integration/m2_substrate_inhabitance_test.rs:3929).

3. Verdict

APPROVE

The substrate expansion is paired with executable evaluator behavior, regenerated bootstrap receipts, and tests that pin both positional semantics and right-first scheduling observability. I did not find an invariant, testing, or debt-tracking violation that is supported by a changed diff line.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 3dfe9c90 · Trigger: schedule
• Thinking: 204s wall

---

✅ No blocking concerns; the added larger-stack test wrappers are documented, bounded, and carry explicit dissolution triggers.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 8b9d6c94 · Trigger: schedule
• Thinking: 250s wall

---

Non-blocking — Strengths

• src/v3/std/runtime.dag The TC2 input-order carrier remains a typed substrate fact with a terminal dissolution receipt, preserves the single applicative strategy variant, and avoids string labels.
• src/v3/compiler/src/lib.rs The Rust mirror gives RightFirst executable behavior that changes evaluation scheduling without reordering transform operands and has direct fail-closed ordering tests.

✅ No blocking concerns in the provided diff.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: e0819ee8 · Trigger: schedule
• Thinking: 249s wall

---

✅ The TC2 input-order substrate, Rust evaluator mirror, generated bootstrap refresh, and focused ratchets look aligned with the runtime thesis; I found no blocking concerns.