Post-merge board hygiene for PR #1144 (D-TEH-3 fate probes)

.claude/board/LATEST_STATE.md

@@ -1,3 +1,20 @@
+## 2026-09-03 — MERGED #1144 (`30b0a66`): D-TEH-3 fate probes closed — two corrections to the delta below
+
+PR #1144 (the delta immediately below) merged after CodeRabbit + Codex review.
+Two things in that delta's original text were corrected DURING review and are
+now stale on this entry (per the append-only rule, not rewritten in place —
+see `PR_ARC_INVENTORY.md`'s 2026-09-03 entry for the full, corrected account):
+
+- The `spiral_segment` i8 table does **NOT** clear the fidelity gate at any
+  tested max_error (Codex caught: rho = 0.9975 < 0.9980 even at its best
+  setting, 0.005) — the delta's u8-only fidelity claim stands, but do not
+  infer it extends to i8.
+- The `semantic_chunker` positive-control diagnostic that confirms the
+  mechanism-null verdict is now a **committed, reproducible 4th arm** inside
+  `chunker_falsifier.rs` itself (CodeRabbit caught it was a throwaway,
+  non-committed script at first) — not the "non-committed positive-control
+  diagnostic" the delta below describes.
+
 ## 2026-09-03 — branch (D-TEH-3 closed, after #1143 merged): both fate probes KILL — INVENTORY DELTA
 
 - MERGED #1143 (D-TEH-3 math half, `f05a358`'s ancestor): `jc::drift` / `jc::quorum` land, `cronbach.rs` deleted (see the 2026-09-02 delta below).

.claude/board/PR_ARC_INVENTORY.md

@@ -10,6 +10,15 @@
 > census §8.3 trap 10: read the body FIRST, then open for write — never
 > inline both in one expression.
 
+## 2026-09-03 — MERGED #1144 (`30b0a66`) — D-TEH-3 fate probes: both KILL, semantic_chunker + spiral_segment stay LAB
+
+- **Added:** `crates/thinking-engine/examples/chunker_falsifier.rs` (real-data falsifier for `semantic_chunker`: 168 cross-topic + 8 same-topic passages, 20 SplitMix64 null permutations, plus a 4th committed positive-control arm — the module's own adversarial synthetic-corners shape — added mid-review so the mechanism-null conclusion is reproducible, not just asserted); `crates/thinking-engine/examples/spiral_gate_probe.rs` (real-data gate probe for `spiral_segment` against five real baked 256x256 tables). Plan `thinking-engine-harvest-closure-v1.md` §4b (pre-registration) + §4c (results); EPIPHANIES `E-TWO-FATE-PROBES-KILL-DIFFERENT-WAYS-1`.
+- **Results:** `semantic_chunker` — recall 0.000 at every pre-registered threshold; the committed positive control also returns zero, confirming a genuine mechanism null rather than a harness artifact. **KILL, stays LAB, not ported to deepnsm-v2.** `spiral_segment` — fidelity clears r/rho >= 0.9980 on every u8 table but NOT on the i8 table (rho tops out at 0.9975 — caught by a Codex review comment on this PR, corrected same-day); compression fails on every table regardless, `ratio_vs_u8 = bytes(u8)/bytes(spiral)` topping out at ~0.28x (i.e. ~3.6x LARGER than the u8 table it would replace), not the module's claimed 51x smaller. **KILL, stays LAB, no certification battery scheduled.** §1c of the closure plan is now fully closed.
+- **Also in this PR:** paid down 25 of the ~40 pre-existing `thinking-engine` clippy lints `TD-THINKING-ENGINE-EXCLUDED-DEBT-1` already named — `world_model.rs::from_engine_state` (10 positional args → a `ThoughtSignals` bundle, verified zero in-tree callers), `cognitive_stack.rs::MetaCognition` / `dto.rs::ThoughtIndex` (added `Default`), `qualia.rs` (19 range-fill loops → `.fill()`), `tensor_bridge.rs` (documented `#[allow]`), `signed_domino.rs` (`enumerate()` rewrite). `cargo test --lib` on every touched module: 337/337 green throughout.
+- **Review folded in (post-push, CodeRabbit + Codex, all via reply-and-resolve rather than silent edits):** the i8 fidelity correction above; the compression-ratio direction stated explicitly (`ratio_vs_u8 = bytes(u8)/bytes(spiral)`) in EPIPHANIES, LATEST_STATE, and STATUS_BOARD after two follow-up passes (the first fix missed STATUS_BOARD entirely); the positive-control diagnostic committed into the falsifier instead of left as an unreproducible throwaway; declined two nitpick asks to add `#[cfg(test)]` modules to the probe examples (they're one-shot fate probes, not shipped API — reasoning posted as a PR comment) and a suggested compat shim for `from_engine_state` (verified zero real callers, crate is workspace-excluded, no consumer to protect — reasoning posted and thread resolved).
+- **Board hygiene:** EPIPHANIES + LATEST_STATE + STATUS_BOARD + TECH_DEBT (dated update, append-only) all updated across four commits as review findings landed; `SUPERSESSION-INDEX.md` regenerated last after every board write, byte-identical each time.
+- **Confidence:** High — every measured number in the results was re-run and read back before being written down, including the two corrections review caught.
+
 ## 2026-09-02 — lance-graph branch `claude/medcare-rs-continue-6nhbxn` (D-TEH-3 PR, after #1142) — calibration MATH → jc; lab copies deleted
 
 - **Added:** `crates/jc/src/drift.rs` (`ReencodeDrift`, `reencode_drift`, `DriftBatch`, `reencode_batch`, `DeltaSummary`, `delta_summary`, `CONVERGENCE_EPS`; 8 tests), `crates/jc/src/quorum.rs` (`pairwise_agreement_u8`, `max_u8_variance`, `QuorumLevel` + floors, `CronbachReport`, `cronbach_report`; 7 tests), two lift-gate tests in `crates/jc/src/reliability.rs`; `pub mod drift; pub mod quorum;` in jc `lib.rs`. EPIPHANIES `E-THE-LIFT-GATE-FOUND-A-TIE-BLIND-SPEARMAN-1`; TECH_DEBT `TD-RELIABILITY-COPIES-OUTSIDE-JC-1`.