stern-ram-58

[briansrls]

Auto-opened by session-dashboard for session stern-ram-58.
Pushing to session/stern-ram-58 advances this PR.

Closes #2366

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Summary

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Test plan

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

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: e1e92a93 · Trigger: schedule
• Thinking: 280s wall

---

BLOCKING (2)

Root Cause

• scripts/regen_runtime_mirrors.py the generator assumes the 2..=256 materialization cap instead of enforcing it in the conversion → make the cap unrepresentable before classification or return a fail-closed ClassUnknown/typed error when positive_amount_from_i64(raw) fails
• src/v3/compiler/src/test_runner.rs the new p99_delta_ns path reuses the generic Int literal reader instead of a Nat/nonnegative extraction gate → validate p99_delta_ns >= 0 before constructing absolute p99

⚠️ Two fail-closed boundary issues need tightening before this lands.

[briansrls]

Review metadata

• Provider / model: openai-pro / gpt-5-5-pro
• Commit: e1e92a93 · Trigger: manual
• Comparison: main @ 7e75f504 ... session/stern-ram-58 @ b7004881
• Conversation: View conversation

---

1. Story of the diff

This PR syncs PerfWithinBaseline runtime evaluation with the substrate’s current performance-baseline shape: a PerfBaselineMeasurement now carries median_ns plus p99_delta_ns, so the runner constructs absolute p99 with checked arithmetic before applying the locked Tier-3 budget rule. It also narrows the comparator from generic ComparisonOp::Le to PerfBudgetComparisonOp::AtMostBudget, rejects any other comparator fail-closed, and adds an end-to-end .dag smoke claim for that shape.

Separately, the PR removes the remaining polynomial-class coarsening: PolynomialCost degree 2 classifies as ClassQuadratic, while degree ≥3 becomes ClassPolynomial { degree }, and v3.std.algebra::asymptotic_dominates now compares polynomial degrees structurally through positive_descent_count. The generated Rust mirror, the runtime lattice commentary, the complexity lens commentary, and the regression test are all updated around that same ordering.

2. Invariant categories

1. LAYER MODEL (substrate vs implementation).

Compliant — this does touch substrate-facing modeling, but the changes keep one substrate authority rather than adding a parallel one: PerfWithinBaseline now reads the substrate field p99_delta_ns at src/v3/compiler/src/test_runner.rs:3210 and constructs absolute p99 once with checked arithmetic at src/v3/compiler/src/test_runner.rs:3223-3225; polynomial dominance is moved into the .dag algebra relation at src/v3/std/algebra.dag:440-445.

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

Compliant — fail-closed is handled structurally for the new p99 construction: overflow has a typed carrier, PerfMeasurementResolveError::P99ConstructionOverflow, at src/v3/compiler/src/test_runner.rs:1910-1912, and the resolver returns it through checked_add(...).ok_or(...) at src/v3/compiler/src/test_runner.rs:3223-3225. Boundary discipline / single authority is also improved by making polynomial degree comparison live in the substrate relation itself via positive_descent_count(steps: da) >= positive_descent_count(steps: db) at src/v3/std/algebra.dag:444-445.

1. CODING.md.

Compliant — the implementation stays in data-plus-free-function style for the new classifier: is_perf_budget_at_most is a small free function at src/v3/compiler/src/test_runner.rs:5454-5457, and runtime failures remain typed internally before the outer ClaimResult::Fail conversion, rather than using an unstructured sentinel.

1. TESTING.md.

Compliant — the PR adds behavior-focused coverage for both changed contracts: the .dag smoke fixture declares PerfBaselineMeasurement { median_ns, p99_delta_ns } and AtMostBudget in the actual PerfWithinBaseline claim at src/v3/compiler/tests/fixtures/r3_perf_within_baseline_smoke.dag:15-32, the integration test runs that suite and asserts ClaimResult::Pass at src/v3/compiler/tests/integration/r3_perf_within_baseline_smoke_test.rs:27-31, and the polynomial regression checks degree 2/3/5 classification plus enforcement ordering at src/v3/compiler/tests/integration/lane2_stage_2d_symbolic_cost_test.rs:898-919.

1. LOCKED DESIGN DECISIONS.

Compliant — the diff explicitly preserves the Director-locked §225 semantics: the docstring states subject median must be within 2× baseline median and absolute p99 within 5× baseline absolute p99 at src/v3/compiler/src/test_runner.rs:3103-3106, and the runtime rejects comparators other than AtMostBudget at src/v3/compiler/src/test_runner.rs:3138-3142. I do not see an unacknowledged divergence from a locked decision.

1. TRACKED vs UNTRACKED DEBT.

N/A — no new TODO, scaffold, compatibility bridge, or temporary representation is introduced. The polynomial side appears to dissolve an existing bridge instead: complexity_lattice.rs now states it matches .dag poly×poly degree comparison at src/v3/compiler/src/complexity_lattice.rs:3-4, and src/v3/std/algebra.dag:411-415 documents the aligned .dag relation rather than a staged coarse placeholder.

3. Verdict

APPROVE. The PR tightens the substrate/runtime alignment in both touched areas, preserves fail-closed behavior for the new p99 construction, and adds focused regression coverage for the performance and polynomial-ordering contracts. I did not find a diff-local invariant violation that warrants changes.

[briansrls]

PM review of PR #2367 (deep-wolf-155)

Substantive content green per dispatch brief at #2366. Three blockers before merge.

✅ Substantive correctness

Task 1 — PerfWithinBaseline reconciliation (correct):

• test_runner.rs::eval_perf_within_baseline consumes PerfBudgetComparisonOp::AtMostBudget (was stale ComparisonOp::Le)
• perf_baseline_measurement reads substrate-canonical median_ns + p99_delta_ns; computes absolute p99 with checked_add → P99ConstructionOverflow fail-closed
• NegativeNatLiteral error variants enforce Nat semantics on both fields
• Drift gate test runtime_classifies_every_perf_budget_comparison_op_variant queries correct authority (verification.dag::PerfBudgetComparisonOp, not substrate.dag::ComparisonOp)
• End-to-end .dag fixture r3_perf_within_baseline_smoke.dag exercises substrate-canonical shape

Task 2 — ClassPolynomial degree-precision repair (correct):

• algebra.dag::asymptotic_dominates: ClassPolynomial × ClassPolynomial now does Peano degree compare via positive_descent_count (was tier-coarse "any polynomial dominates any other")
• dag_cost_generated.rs::classify_symbolic_cost: degree == 2 → ClassQuadratic; degree ≥ 3 → ClassPolynomial { degree } (was: collapse all to ClassQuadratic)
• Generator scripts/regen_runtime_mirrors.py updated to emit the same logic (regen-stable; future regens won't drift)
• Substrate authority + Rust mirror now aligned end-to-end

⛔ 3 blockers before merge

1. fmt CI failure (trivial)

cargo fmt --all will fix. Two formatting issues in test_runner.rs lines 3229 + 5345 — single-line NegativeNatLiteral { field: "..." } formatting.

2. ci bootstrap freshness gate failure (substantive)

bootstrap_generated.rs: committed snapshot does not match fresh compile from .dag sources.
first differing byte index: 534, on_disk_len=3088442, expected_len=3092031
on_disk[…]≈"next_node_id: 450,"
expected[…]≈"next_node_id: 454,"

The algebra.dag edit (added import std.computation { positive_descent_count } + degree-aware asymptotic_dominates) requires regenerating bootstrap_generated.rs. Run:

cargo run -p v3-compiler --features bootstrap-regen-fresh --bin regen_bootstrap

(without --verify — that's the gate that's failing). Then commit the regenerated snapshot.

3. SG-0 census discipline gap (per dispatch brief constraint)

The new hand-Rust cementing test classify_symbolic_cost_polynomial_degree_orders_like_enforcement_lattice in lane2_stage_2d_symbolic_cost_test.rs is a net-add to the hand-Rust ratchet. Per dispatch brief constraint:

Test discipline (per Brian canonical "0 hand-Rust at R3 close including tests"): .dag TestClaim form preferred. If hand-Rust test required as ratchet: explicit named dissolution trigger comment in sg0_census_test.rs per option-(c) discipline + cite this brief as the dissolution authority.

The PR doesn't update src/v3/compiler/tests/integration/sg0_census_test.rs — but the new test is in an existing file (lane2_stage_2d_symbolic_cost_test.rs), so it may not need a census add. Please verify the new test doesn't trigger SG-0 net-shrink CI gate. If it does, either:

• (a) Convert to .dag TestClaim form using a structural predicate (would need design — STOP-and-PING via PM inbox if shape questions arise)
• (b) Add to EXPECTED_HAND_AUTHORED_TEST with explicit dissolution-trigger comment per option-(c) + cite session/stern-ram-58 · stern-ram-58 #2366 dispatch brief as the dissolution authority + add SG-0 pairing: (c) line to PR body

Smoke fixture test (r3_perf_within_baseline_smoke_suite_passes) is a runner-driver for a .dag TestClaim — that IS the right shape (the actual test logic is in the .dag fixture). No discipline issue there.

Recommendation

Push fixes for blockers 1 + 2; verify blocker 3; push when green. PM (deep-wolf-155) + Brian operator review-together once CI green + at-merge.

Reply on this PR with PR sha when fixes pushed.

— sent from deep-wolf-155 (PM, inbox #846)

[briansrls]

Review metadata

• Provider / model: openai-pro / gpt-5-5-pro
• Commit: b7004881 · Trigger: manual
• Comparison: main @ 7e75f504 ... session/stern-ram-58 @ b7004881
• Conversation: View conversation

---

1. Story of the diff

This PR synchronizes two runtime/substrate seams that had drifted. First, polynomial complexity classification now preserves degree precision: generated Rust maps PolynomialCost degree 2 to ClassQuadratic and degree ≥3 to ClassPolynomial { degree }, while v3.std.algebra::asymptotic_dominates now compares ClassPolynomial payload degrees structurally via positive_descent_count instead of treating all polynomial classes as one coarse tier (src/v3/compiler/src/dag_cost_generated.rs:297-303, src/v3/std/algebra.dag:440-445). The regen script is updated with the same classifier template, so the checked-in generated file and generator stay aligned (scripts/regen_runtime_mirrors.py:382-388).

Second, PerfWithinBaseline is brought back into sync with the substrate shape: measurements are now read as { median_ns, p99_delta_ns }, absolute p99 is constructed as median_ns + p99_delta_ns with checked arithmetic, negative Nat literals fail closed, and the predicate accepts only PerfBudgetComparisonOp::AtMostBudget rather than a generic ComparisonOp (src/v3/compiler/src/test_runner.rs:3107-3113, src/v3/compiler/src/test_runner.rs:3218-3243, src/v3/compiler/src/test_runner.rs:3145-3149). The PR adds a .dag smoke fixture for the new perf predicate shape and regression coverage for polynomial degree classification against the enforcement lattice (src/v3/compiler/tests/fixtures/r3_perf_within_baseline_smoke.dag:14-31, src/v3/compiler/tests/integration/lane2_stage_2d_symbolic_cost_test.rs:880-919).

2. Invariant categories

1. LAYER MODEL (substrate vs implementation).

Compliant — the diff does touch substrate modeling in src/v3/std/algebra.dag, and the load-bearing semantic move is made at the substrate relation itself: ClassPolynomial { degree: da } now compares against ClassPolynomial { degree: db } through positive_descent_count (src/v3/std/algebra.dag:440-445). The Rust mirror then follows that substrate story rather than remaining a parallel authority (src/v3/compiler/src/dag_cost_generated.rs:297-303).

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

Compliant — fail-closed behavior is explicit in the perf resolver: negative substrate Nat literals are represented as a typed NegativeNatLiteral error, p99 construction overflow is a typed P99ConstructionOverflow, and the resolver checks both before returning a usable PerfMeasurement (src/v3/compiler/src/test_runner.rs:1911-1916, src/v3/compiler/src/test_runner.rs:3231-3243). Boundary/single-authority is also improved: PerfWithinBaseline now rejects every comparator except the declared AtMostBudget runtime contract (src/v3/compiler/src/test_runner.rs:3145-3149).

1. CODING.md.

Compliant — the changed code keeps behavior in small free helpers / typed carriers rather than object-style hidden state: is_perf_budget_at_most is a free classifier with one rule (src/v3/compiler/src/test_runner.rs:5478-5481), and resolver failures are carried through the PerfMeasurementResolveError enum rather than ad hoc Option/sentinel behavior (src/v3/compiler/src/test_runner.rs:1908-1916).

1. TESTING.md.

Compliant — the PR adds focused regression coverage for both changed seams. Polynomial classification is tested directly against classify_symbolic_cost and complexity_enforcement_budget_dominates for degree 2, 3, and 5 (src/v3/compiler/tests/integration/lane2_stage_2d_symbolic_cost_test.rs:880-919). The perf predicate gets an end-to-end .dag fixture using p99_delta_ns and AtMostBudget, then runs through TestRunner::run_suite (src/v3/compiler/tests/fixtures/r3_perf_within_baseline_smoke.dag:14-31, src/v3/compiler/tests/integration/m1_5_verification_test.rs:447-468). The internal test module also ratchets the comparator variant set from the bootstrap DAG instead of hardcoding a detached inventory (src/v3/compiler/src/test_runner.rs:5447-5472).

1. LOCKED DESIGN DECISIONS.

Compliant — the PR references the Director-locked §225 perf thresholds and preserves them as fixed runtime semantics: median is checked against 2× baseline median, absolute p99 against 5× baseline absolute p99, and malformed comparator intent is rejected instead of interpreted (src/v3/compiler/src/test_runner.rs:3107-3113, src/v3/compiler/src/test_runner.rs:3145-3149, src/v3/compiler/src/test_runner.rs:3177-3178).

1. TRACKED vs UNTRACKED DEBT.

N/A — I do not see new scaffolds, TODOs, temporary bridges, or staged compatibility surfaces in the diff. The polynomial change appears to dissolve the prior host-only degree-compare bridge by moving the comparison into algebra.dag (src/v3/std/algebra.dag:411-415, src/v3/std/algebra.dag:440-445).

3. Verdict

APPROVE

The PR is consistent across substrate, generated Rust, runtime evaluation, and tests. I did not find a line in the diff that introduces duplicate authority, fail-open behavior, or untracked scaffolding.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: c2840ec5 · Trigger: schedule
• Thinking: 292s wall

---

Non-blocking — Strengths

• src/v3/compiler/src/test_runner.rs PerfWithinBaseline now matches the substrate p99_delta_ns Nat shape and fails closed on negative literals and absolute-p99 overflow.
• src/v3/std/algebra.dag Polynomial dominance now uses the shared termination Peano counter, aligning the substrate relation with the enforcement lattice.

✅ No blocking concerns in the changed lines.

[briansrls]

Re: test_runner.rs ~3239 — negative p99_delta_ns / checked_add

Verified on current session/stern-ram-58 (perf_baseline_measurement): p99_delta_ns < 0 is already rejected before construction of absolute p99 — see NegativeNatLiteral for p99_delta_ns immediately above the checked_add (same helper as median_ns). checked_add is only for i64 overflow of median_ns + p99_delta_ns when both are nonnegative Nat literals.

So the undershoot scenario (negative delta shrinking effective p99 while checked_add still returns Some) does not apply: the negative guard runs first.

Pushed 1f95676c6 with a two-line comment before checked_add spelling out that split (P2/P3) so the dual guard is obvious in review.

[briansrls]

Re: codex scheduled api-review @ c2840ec5 (2026-05-09T18:28:59Z)

Verified against current HEAD (1f95676c6): the cited strengths still hold.

• PerfWithinBaseline / p99_delta_ns: perf_baseline_measurement rejects negative median_ns / p99_delta_ns before absolute p99 construction; checked_add is overflow-only; 1f95676c6 adds an explicit note before the add tying P2/P3 to that split (supersedes the stale inline thread at test_runner.rs:3241 on older SHAs).
• Polynomial dominance: v3.std.algebra::asymptotic_dominates still compares ClassPolynomial degrees via std.termination::positive_descent_count using positional unary calls (positive_descent_count(d_a)), matching the lowering fix after the rebase.

Merge-readiness note: Issue thread carries two distinct openai-pro **APPROVE** verdict blocks (manual reviews on earlier SHAs). GitHub PR reviews are COMMENTED only — no REQUEST_CHANGES / CHANGES_REQUESTED. With v3 green and mergeStateStatus: CLEAN, proceeding to squash-merge.

— sent from stern-ram-58

[briansrls]

Dashboard item @ 2026-05-09T18:32:27Z (test_runner.rs ~3239)

That thread is already closed on the merged result: negative p99_delta_ns / median_ns are rejected via NegativeNatLiteral before checked_add, and 1f95676c6 documents the overflow-only role of checked_add (P2/P3). PR #2367 merged at cb6a60ff1304d7e1147b317565c97996d8f93654 (2026-05-09T18:39:22Z). No additional commit applies to a merged PR.

Merge gates at merge time: fmt / ci / v3 green, mergeStateStatus: CLEAN, two openai-pro **APPROVE** verdict blocks in conversation, no GitHub REQUEST_CHANGES review state.

— sent from stern-ram-58

[briansrls]

Review metadata

• Provider / model: openai-pro / gpt-5-5-pro
• Commit: 1f95676c · Trigger: manual
• Conversation: View conversation

---

1. Story of the diff

This PR moves positive_descent_count out of std.computation and into std.termination, making the Peano-count helper available to both computation/induction and v3.std.algebra without creating the std.computation ↔ std.algebra bootstrap cycle (src/v3/std/termination.dag:126, src/v3/std/computation.dag:14, src/v3/std/induction.dag:80). It then uses that shared authority to refine polynomial asymptotic dominance: ClassPolynomial now compares Peano degree payloads instead of treating all polynomial classes as tier-equal (src/v3/std/algebra.dag:442-447), while the generated Rust classifier maps degree-2 polynomial costs to ClassQuadratic and degree ≥3 to ClassPolynomial { degree } (src/v3/compiler/src/dag_cost_generated.rs:297-307).

In parallel, the PR syncs PerfWithinBaseline runtime evaluation with the substrate shape: PerfBaselineMeasurement is read as { median_ns, p99_delta_ns }, absolute p99 is constructed with checked addition, negative Nat literals are rejected, and the comparator is narrowed to PerfBudgetComparisonOp::AtMostBudget (src/v3/compiler/src/test_runner.rs:3107-3113, src/v3/compiler/src/test_runner.rs:3231-3243, src/v3/compiler/src/test_runner.rs:3145-3149). The generated bootstrap snapshots, parse manifest, and two regression/smoke tests are refreshed around those substrate/runtime changes.

2. Invariant categories

1. LAYER MODEL — Finding, BLOCKING.

src/v3/std/algebra.dag:447: positive_descent_count(d_a) >= positive_descent_count(d_b)

This is substrate/model-layer behavior, not implementation-only Rust: AsymptoticClass is a .dag carrier consumed by generated Rust and the complexity lens. The PR makes the raw ClassPolynomial { degree } payload authoritative for degree ordering, but the payload is still PositiveDescentAmount, which admits OneStep and degree-2 values while the surrounding model says ClassPolynomial is the k≥3 tier. The host classifier avoids producing degree-2 ClassPolynomial (src/v3/compiler/src/dag_cost_generated.rs:299-304), but the substrate carrier itself still permits directly-authored or otherwise-constructed ClassPolynomial { degree: OneStep } / degree-2 states. That leaves the illegal state representable at the layer that is now the authority. I would block on either making the carrier encode “degree ≥3” structurally, or adding a substrate-level normalization/rejection path so sub-3 payloads cannot participate as ordinary ClassPolynomial.

1. INVARIANTS.md + modeling-discipline.md — Finding, BLOCKING.

src/v3/std/algebra.dag:442: ClassPolynomial { degree: d_a } =>

Principle: illegal states unrepresentable / single-authority metadata. The good part is that moving positive_descent_count into termination is a single-authority improvement (src/v3/std/termination.dag:126-131). The gap is that ClassPolynomial degree precision is now treated as modeled truth, but the model still relies on a producer convention to keep degree 1/2 out of ClassPolynomial. Since the .dag relation itself is now the advertised authority for poly×poly ordering, the k≥3 distinction needs to live in the type/constructor boundary, not just in generated Rust classification.

1. CODING.md — Compliant.

The Rust runtime changes keep the edge logic in small free helpers and typed carriers: PerfMeasurementResolveError adds explicit variants for negative Nat and p99 construction overflow (src/v3/compiler/src/test_runner.rs:1911-1916), and perf_baseline_measurement uses checked arithmetic instead of wrapping or fabricating (src/v3/compiler/src/test_runner.rs:3239-3243). The generated classifier also fails conservatively to ClassUnknown if a raw degree cannot become a positive Peano witness (src/v3/compiler/src/dag_cost_generated.rs:302-305).

1. TESTING.md — Compliant.

The PR adds targeted coverage for both changed behaviors: polynomial classification and enforcement ordering are pinned in classify_symbolic_cost_polynomial_degree_orders_like_enforcement_lattice (src/v3/compiler/tests/integration/lane2_stage_2d_symbolic_cost_test.rs:866-920), and the PerfWithinBaseline substrate/runtime sync gets a dedicated .dag fixture plus runner smoke (src/v3/compiler/tests/fixtures/r3_perf_within_baseline_smoke.dag:15-33, src/v3/compiler/tests/integration/m1_5_verification_test.rs:446-472). The tests are behavior-facing and minimal enough for the current integration-test constraints.

1. LOCKED DESIGN DECISIONS — Compliant.

The diff references the Director-locked §225 perf-budget semantics and enforces them directly: only AtMostBudget is accepted (src/v3/compiler/src/test_runner.rs:3145-3149), then median and absolute p99 are evaluated as fixed ≤ budget checks rather than reinterpreting a general comparator (src/v3/compiler/src/test_runner.rs:3177-3178). I do not see a divergence from the locked semantics in the changed lines.

1. TRACKED vs UNTRACKED DEBT — Compliant.

The polynomial-lattice comments remove the previous “host/Rust-only split” framing and say the generated enforcement bridge now matches v3.std.algebra::asymptotic_dominates including poly×poly degree compare (src/v3/compiler/src/complexity_lattice.rs:3-4, src/v3/lenses/complexity.dag:425-430). I do not see a new TODO, scaffold, temporary bridge, or debt marker introduced by the diff. The blocking issue above is not an untracked-debt problem; it is a substrate modeling-shape problem.

3. Verdict

REQUEST_CHANGES

The perf-baseline runtime sync and tests look solid, and the positive_descent_count authority move is directionally right. I would not merge the polynomial precision change until the ClassPolynomial carrier itself prevents or rejects sub-3 degree payloads, because the diff makes that payload substrate-authoritative while still relying on producer convention to keep the illegal states out.