shard(hygiene): 2026-05-05T08:00Z -- BigInt/UoM cluster + crash recovery

docs/hygiene-history/ticks/2026/05/05/0800Z.md

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+| 2026-05-05T08:00Z | opus-4-7 / autonomous-loop continuation | `<<autonomous-loop>>` | **BigInt/UoM cluster + crash recovery + forwarded-conversation discipline.** 15+ PRs landed in 3h window since 04:45Z shard plus PC-crash midstream. Pre-crash: B-0191 final, B-0006 tier-49, B-0193 bootstrap-razor row, knights/knaves preservation, B-0194 IncrementalAuto + checkBilinear, src/Core/Units.fs (22 tests, 4 UoM declarations, derived-measure algebra), F# RFC pre-draft #1591, B-0195 DBSP cross-check row, DBSP Prop 3.5 verification (CONFIRMED counter-example, MISATTRIBUTED paper citation), B-0197 Lean cleanup row. Crash + recovery: cron lost + re-armed, git clean, no work loss (c836d6f had been pushed). Post-crash: B-0196 BigInt + bignumber row, B-0198 upstream-contribution row, B-0196 acceptance criterion (d) verification (F# UoM does not natively extend to BigInteger). Three Claude.ai conversations forwarded -- preserved verbatim where authorized (PR #1588 knights/knaves), held as chat-record where the conversation flagged substrate-inflation risk. Goldfish-ontology check fired correctly on ARC-AGI-3 (existing substrate). | #1571 / #1583 / #1584 / #1587-1599 cluster | Crash recovery validated empirically that committed substrate IS the continuity mechanism: cron died, in-memory state died, but git history + GitHub PR state was authoritative + sufficient. The cron-substrate-continuity rule from PR #1574 confirmed at infrastructure level. |
+
+# Tick shard 2026-05-05T08:00Z -- BigInt/UoM cluster + crash recovery + forwarded-conversation discipline
+
+**Cron firing**: continuation from the 04:45Z shard. Substantial cluster landed in this 3h window plus a PC-crash recovery midstream.
+
+## What landed (chronological)
+
+### Pre-crash cluster
+
+- **PR #1571** (B-0191 orchestrator branch-verify revised to harness-hooks) -- final merge after iterating reviewer waves on derived measures, namespace-scope reuse, zero-rate guards, Checked arithmetic, module-name convention, role-ref discipline.
+- **PR #1583** (B-0006 tier-49, 36 entries compressed) -- background subagent.
+- **PR #1584** (04:45Z tick shard).
+- **PR #1587** (B-0193 bootstrap-razor row) -- Aaron 2026-05-05 *"specs and open spec the source of truth ... recreate everything in 23 hours"* + scope correction *"lets not delete the code here, we can test that in a new repo"*.
+- **PR #1588** (knights/knaves + round table + Harmonious Division + bootstrap razor preservation) -- mirror-not-beacon.
+- **PR #1589** (B-0194 IncrementalAuto dispatcher + checkBilinear law + active-patterns).
+- **PR #1590** (`src/Core/Units.fs` + 22 unit tests) -- 4 highest-pay UoM declarations + zero-rate guards + msToNs Checked.(*) overflow + applyDelta Checked.(+) overflow + bidirectional reuse of namespace-scope tick/ms.
+- **PR #1591** (F# RFC pre-draft for existential-quantification-in-type-tests) -- Don Syme as anchor.
+- **PR #1592** (B-0195 DBSP chain rule cross-check + writeup decision row).
+- **PR #1593** (DBSP cross-check verification) -- counter-example CONFIRMED, Prop 3.5 attribution PARTIAL/MISATTRIBUTED.
+- **PR #1594** (B-0197 Lean Prop 3.5 misattribution cleanup row).
+
+### Crash + recovery
+
+PC crashed mid-save. Cron lost. Recovery checklist:
+
+1. `CronList` returned no jobs -> re-armed via `CronCreate` (`* * * * *`, `<<autonomous-loop>>` sentinel, durable=true intent-doc). Per the CLAUDE.md *"Tick must never stop -- every-tick-verify because the cron mechanism is unreliable"* rule (line 661+), harness output confirmed session-only despite durable flag.
+2. `git status` on main + B-0196 worktree: clean. Last commit pre-crash (`c836d6f`) had been pushed; no work lost.
+3. PR-state refresh via `bun tools/github/poll-pr-gate-batch.ts` showed reviewer threads on #1595 (B-0196 BigInt row) accumulated during crash.
+
+### Post-crash cluster
+
+- **PR #1595** (B-0196 BigInt + bignumber integration row) -- iterated through multiple reviewer waves: derived per_tick/per_sec measures, NormalGamma -> NormalInverseGamma, tools/z3 -> tools/Z3Verify, four-property hodl as binding acceptance test, three human anchors (Tanner Gooding / Don Syme / Leonid Ryzhyk with engagement-gate), reciprocal composes_with on B-0140/B-0156/B-0189/B-0194, markdownlint MD032 + MD018 + MD027 fixes, last_updated bumps, soften UoM-on-BigInteger pre-answer to hypothesis-with-search-required.
+- **PR #1596** (B-0198 F# UoM-on-BigInteger upstream contribution row) -- absorb-and-contribute discipline; two contribution shapes (lightweight comment on fslang-suggestions/831 vs heavier RFC pre-draft); engagement gate per Prop 3.5 misattribution lesson.
+- **PR #1597** (B-0196 acceptance criterion (d) verification) -- WebSearch confirmed F# UoM does NOT natively extend to BigInteger. Microsoft Learn + FSharp.UMX + fslang-suggestions/831 cited.
+
+## Load-bearing learnings
+
+| Learning | Substrate landing |
+|----------|---|
+| Crash recovery checklist (cron-first, git-state-second, PR-state-third) | This shard + the *"Tick must never stop -- every-tick-verify because the cron mechanism is unreliable"* CLAUDE.md bullet |
+| Bootstrap-razor scope correction (new-repo experiment, NOT destructive on Zeta) | B-0193 row (PR #1587) |
+| DBSP Prop 3.5 attribution was wrong on Zeta side, not the paper | PR #1593 cross-check + B-0197 cleanup row (PR #1594) |
+| Four-property hodl invariant (DST-safe + lock-free + scale-free + DBSP-native) is conjunctive; partial application produces partial verification | B-0196 + B-0193 worked-example references |
+| F# UoM does not natively extend to BigInteger; community workarounds (FSharp.UMX-style phantom types) generalize the technique | PR #1597 verification + B-0198 contribution row |
+| Goldfish-ontology check before filing new substrate caught duplicate-substrate impulse on ARC-AGI-3 (already in `memory/project_arc3_beat_humans_at_dora_in_production_capability_stepdown_experiment_2026_04_22.md`) | Not new; existing substrate; this shard records the catch |
+
+## Conversations preserved as research-record (NOT new substrate)
+
+Three Claude.ai shards forwarded by Aaron during this window. Per mirror-not-beacon discipline, the conversations were preserved verbatim where directly authorized (PR #1588 knights/knaves), and held as chat-record where the conversation itself flagged substrate-inflation risk (the topological-invariants / smooth-by-construction / DORA-as-map / ARC-AGI-3 synthesis pieces). The pattern named in the conversation -- ZFCv2 + aperiodic geometry + category theory cumulative trajectory IS the substrate-inflation pattern at the framework-architecture layer -- was correctly identified by the shard, agreed on by Aaron, and is operational ongoing under bootstrap-razor (B-0193) examination on schedule.
+
+## Cron-substrate continuity check
+
+Crash recovery validated empirically that committed substrate IS the continuity mechanism: cron died, in-memory state died, but git history + PR state on GitHub was authoritative + sufficient for a fresh session to pick up exactly where the prior session left off. The `c836d6f` commit had landed on origin before the crash; recovery cost was bounded to re-arming cron + reading the current state. No work loss.
+
+## Next-tick orientation
+
+- 5 stale 2026-05-01/02 open PRs (#1107, #1181, #1182, #1183, #1200) remain unaddressed -- substantive review out of scope for autonomous-loop ticks; flagged for fresh-context attention.
+- Bootstrap-razor (B-0193) examines the framework-elaboration cluster (Maji/Messiah, Harmonious Division, ZFCv2 candidate, topological-invariants direction) on its scheduled cadence.
+- ARC-AGI-3 public-benchmark data point + Chollet's March 2026 release composes with Aaron's existing personal-ARC3 substrate; not yet integrated. Held as conversation-record.
+- B-0198 contribution row sits at engagement-gate; lightweight option (comment on fslang-suggestions/831) is one-shot, ready when Aaron decides.