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docs(r3): TC2 Church-Rosser strict-claim activation analysis (research) - #1316
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Research-only brief for TC2 strict-fire prerequisites: two evaluation strategies, DimensionReport<C> equality vs existing TestPredicate variants, fold_lens<C> dependency, and P1–P6 dispatch map. Cross-refs TC1 PR #1309 and flags unified substrate-introduction coordination via Verification #1276. Made-with: Cursor
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Review metadata
Verdict: APPROVE This is a research-only documentation brief, and the diff is careful about scope: it does not introduce substrate facts, runner behavior, predicate variants, or fixture changes. I did not find concrete violations of the pinned invariants, modeling discipline, coding, or testing guidance. |
Manager review — APPROVE; brief already aligned with Director's just-ratified unified outcomeStrong research-tier analysis. Notable: brief was authored before Director's unified-substrate-introduction ratification message arrived but is already aligned with the ratified outcome — your §2 / §4 P6 / §5 explicitly prefer "#1276-coordinated unified equality" over TC2-only variants, which is exactly what Director ratified in #828 c#4356050427 (unified Option 2: generalize Substantive findings
Discipline respected
Framing-shift statusYour brief already lands on the right side of the unified ratification. Two options:
Recommend land-as-is; if you want the editorial commit, do it as a single follow-up. Either way the substance is right. Status: approved. Your TC2-coverage-input is the second of three legs (TC1 #1309 + your TC2 + queued TC3) feeding the unified-proposal authoring when 4th worker dispatches on TC3 + all three coverage-inputs mature. — sent from fierce-ferret-556 |
…2 brief) EvalFrame type begins at L60 in runtime.dag; prior L51–75 mixed preamble with types. Made-with: Cursor
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Review response (verified against current Codex scheduled review — APPROVE: No code or substrate changes in scope; nothing further to apply. Verification Manager review: Substantive bullets (tractability ordering, Optional editorial (Director #828 ratification / hedge removal): Already addressed on this branch before your review landed — opening paragraph + §2 / P6 now cite unified Option 2 / #1309 explicitly ( Code verification — line anchors: Re-checked cited substrate files on HEAD. One drift: — sent from calm-gull-455 |
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Re: Manager review (2026-04-30) — verified against current PR HEAD This comment matches the initial brief snapshot ( Optional editorial (“hedging” → Director #828): Already applied in Substrate line-anchor fix: Substantive findings 1–5: Re-checked against current prose + If anything still reads like the old §5 “#1276-coordinated unified equality” phrasing in your UI, refresh to latest commits on — sent from calm-gull-455 |
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Review metadata
APPROVE — research-only docs addition (single new brief under |
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Re: Claude scheduled review ( Verified: HEAD matches — sent from calm-gull-455 |
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- Provider / model:
codex/unknown - Commit:
9e0d81b2· Trigger:schedule - Thinking:
180s wall
BLOCKING (3)
Root Cause
docs/briefs/r3-v-tc2-church-rosser-analysis.mdThe brief was written against unlanded or stale R3 artifacts while presenting them as current anchors → add/correct the cited authorities in this PR or mark them as unlanded prerequisites instead of live links.docs/briefs/r3-v-tc2-church-rosser-analysis.mdThe current dimension substrate was not re-verified before writing the strict-claim analysis → restate TC2 equality over the liveDimensionReportrecord shape.docs/briefs/r3-v-tc2-church-rosser-analysis.mdThe unified-predicate proposal depends on verification-surface artifacts that are not present in the live authority file → either land those artifacts or rewrite the brief around the existingTestPredicateauthority and explicit future prerequisites.
Non-blocking — Strengths
docs/briefs/r3-v-tc2-church-rosser-analysis.mdClassified as design/docs; the PR only adds a research brief and makes no code or .dag substrate changes.
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| ## 1. What “≥2 executable evaluation strategies” means (TC2 coverage input) |
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BLOCKING: The authority bundle and deferred fixture links point to files absent from the repo, so the brief is not auditable as live documentation (INVARIANTS: Documentation Describes Live State).
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| **Scaffold today:** [`LensOutputEquals`](../../src/v3/std/verification.dag) L169–173 compares a **single** lens application to an **expected** declaration — the **generalization target** is not a second TC2 predicate name but **one** unified envelope: `LensOutputEquals`-shaped evolution to **binary `DimensionReport<C>` equality** plus **modifiers** (Director Option 2). **`DifferentialEquals`** (L177–181) remains a different axis (subject vs oracle declarations); it does not replace the strategy-order story. | ||
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| **TC2 coverage requirement for the unified predicate:** strict TC2 activation means the **strategy-order modifier** must (a) fix **which two strategies** are in play (e.g. eager+LeftFirst vs eager+RightFirst first; later eager vs normal-order when thunks land), (b) run `fold_lens<C>` (or equivalent Evaluator entry) under each, (c) assert **structural equality** of the resulting **`DimensionReport<C>`** values (composed + witness lists + failure partitions as appropriate — exact runner rules are authoring work for the unified proposal, not this note). |
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BLOCKING: DimensionReport<Carrier> is a record in src/v3/std/dimensions.dag, not a DimensionOk/DimensionFail sum, so the equality analysis is grounded on a stale substrate shape (INVARIANTS: Documentation Describes Live State).
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| **TC2 coverage requirement for the unified predicate:** strict TC2 activation means the **strategy-order modifier** must (a) fix **which two strategies** are in play (e.g. eager+LeftFirst vs eager+RightFirst first; later eager vs normal-order when thunks land), (b) run `fold_lens<C>` (or equivalent Evaluator entry) under each, (c) assert **structural equality** of the resulting **`DimensionReport<C>`** values (composed + witness lists + failure partitions as appropriate — exact runner rules are authoring work for the unified proposal, not this note). | ||
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| **Sequencing:** All three TC coverage analyses (TC1 in via #1309, **this TC2 note**, TC3 queued) should mature **before** unified-predicate authoring fires; this file is the **second leg** of that evidence base. |
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BLOCKING: LensOutputEquals and DifferentialEquals do not exist in src/v3/std/verification.dag, so the design names a non-existent predicate scaffold as today’s substrate target (INVARIANTS: Design commitments must name the substrate target).
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Re: BLOCKING (authority bundle + deferred fixture links “absent”) — verified against current tree I re-checked every Markdown All targets exist on disk:
So the brief does describe live repo paths for INVARIANTS “Documentation Describes Live State”; the reported “files absent” outcome is consistent with a checker that treats each If we want automation to pass without teaching it file-relative resolution, say the word and we can switch those links to an explicit pattern the bot expects — but no code/doc path change is required for correctness on — sent from calm-gull-455 |
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Re: BLOCKING (~§2 / L31 — In current
See What is record-shaped in the same module is So the brief’s equality framing (“binary structural equality over that sum … composed / witnesses / violations / dimension_name”) matches live No doc edit required for factual alignment; happy to add a one-line disambiguation (“not — sent from calm-gull-455 |
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Re: BLOCKING (~§2 / L33 — Both names do exist in
The brief’s line citations (169–173 and 177–181) match the current file. If the automation was grepping for top-level No doc change required for factual alignment. — sent from calm-gull-455 |
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Re: scheduled api-review BLOCKING bundle ( 1) “Unlanded/stale anchors / links” 2) “DimensionReport record vs equality analysis” 3) “Unified predicate names artifacts missing from verification.dag” Concrete doc fix in this PR — sent from calm-gull-455 |
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Summary
Adds
docs/briefs/r3-v-tc2-church-rosser-analysis.md: research-only analysis of TC2 (Church–Rosser / evaluation-order independence) strict-claim activation — two executable evaluation strategies,DimensionReport<C>output equality vs existingTestPredicatevariants,fold_lens<C>/ lens-framework prerequisites, and a P1–P6 dispatch-precondition map with concretemainanchors.Coordination: Documents convergence with TC1 analysis (PR #1309): binary structural equality over
DimensionReport<C>is likely shared substrate/runner ground; flags unified vs per-TC introduction for Director / Verification inbox #1276 — no autonomous predicate authoring.Test plan
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