gov: #422 post-merge governance — LATEST_STATE row + PR_ARC_INVENTORY entry

Post-merge board hygiene for #422 (`docs(handover): PR #418/#419 review +
surreal/mailbox/Baton/SoA-as-BindSpace-surrogate plan map`, merged commit
984512b on top of doc commit a29946b). #422 itself was a read-only handover
that didn't anticipate its own merge row; this PR mirrors the established
post-merge governance pattern (cf. #354 → #353).

Locks in the in-session SurrealDB role correction
(Zone-2 cold store → view over leading LanceDB) and the two-figure footprint
distinction (bare columns ~24-50 B vs full hot thought ~6 KB) as the
canonical readings, with the navigability follow-up
(.claude/surreal/SUPERSEDURE_NOTE_2026-05-27.md pointer file) explicitly
deferred.

No code change. Append-only via tee -a (Edit/Write denied on bookkeeping
files); dated framing preserves the rule-#1 PREPEND convention.

https://claude.ai/code/session_01FMooFcE7hgRWWvknNr2N4i

Author: claude

.claude/board/LATEST_STATE.md

@@ -436,3 +436,15 @@ PR sequence: #360 → #361 → post-#360 substrate-sweep (this PR).
 ### Relationship to prior art
 
 `lance-graph-callcenter::odoo_alignment` already ships a parallel `dolce_odoo()` + `DolceMarker` + `ODOO_SEED` table. This is the ontology-side counterpart (TTL hydration into `OntologyRegistry`); consistent doctrine (Option B, same pivots), distinct crate + distinct `DolceCategory` enum per task spec. Cross-crate dedup is a possible follow-up, not done here.
+
+---
+
+## 2026-05-28 — Append: PR #422 shipped (post-merge governance for the #418/#419 review handover)
+
+(Per APPEND-ONLY rule: this dated annotation augments the "Recently Shipped PRs" table above. Treat the row below as the new top-of-table entry.)
+
+### Recently Shipped PRs — new top row
+
+| PR | Merged | Title | What it added |
+|---|---|---|---|
+| **#422** | 2026-05-28 | docs(handover): PR #418/#419 review + surreal/mailbox/Baton/SoA-as-BindSpace-surrogate plan map | Read-only synthesis handover. New `.claude/handovers/2026-05-28-1200-pr-418-419-surreal-mailbox-baton-plan-map.md` (~310 LOC, 7 sections): §1 PR #418 review (verdict *sound, merge-ready as a spec* + 3 substantive notes on the bare-columns-vs-hot-thought footprint distinction, `E-RUBICON-RACTOR` as honest post-hoc CONJECTURE, OQ-4 doctrinal gating); §2 the **SurrealDB role correction** (Zone-2 cold store → *view over leading LanceDB*, recorded in `E-RUBICON-RACTOR` + plan §2.7); §3 the plan corpus map (8 plans + 9 epiphanies + `PR-NDARRAY-MIRI-COMPLETE → D-CE64-MB-1-impl → D-MBX-1..6` dep chain + `TD-RESONANCEDTO-DUP-1`); §4 brief #419 review (unrelated to surreal/mailbox; the 14 `NEEDS-INPUT` blockers are the real gate for D-ODOO-SAV-4); §5 navigability meta-finding (the surreal POC docs lack a supersedure pointer); §6 action surface; §7 cross-refs. Board appends: `EPIPHANIES.md` ← `E-SURREAL-POC-UNANNOTATED-SUPERSEDURE` (FINDING / navigability); `AGENT_LOG.md` ← session row. **Zero code change**; 3 files; +310/-0. Branch `claude/lance-graph-ontology-review-Pyry3` → `main`. Merge commit `984512b` on top of `a29946b` (the doc commit, rebased onto post-#421 `main` to resolve the AGENT_LOG append-vs-append conflict by keeping both #421's AXIS-B row and this PR's session row in chronological order). |

.claude/board/PR_ARC_INVENTORY.md

@@ -1979,3 +1979,34 @@ Removes `crate-ci/typos` spell-check job from `style.yml`; `cargo fmt --check` r
 - `.claude/RECON_ONTOLOGY_CRATE.md` (Phase 1 recon, commit `edef321`).
 - `.claude/DECISION_SPO_ARIGRAPH.md` (SPO-1 decision, commit `edef321`).
 - This board update (LATEST_STATE.md table + Inventory; INTEGRATION_PLANS.md status annotation on `sql-spo-ontology-bridge-v1`; EPIPHANIES.md SPO-1 disposition entry; AGENT_LOG.md run entry).
+
+---
+
+## PR #422 — docs(handover): PR #418/#419 review + surreal/mailbox/Baton/SoA-as-BindSpace-surrogate plan map (MERGED 2026-05-28 → main)
+
+(Per APPEND-ONLY mechanic: this entry is appended at file-end; the rule-#1 PREPEND convention is preserved by the dated framing — treat as new top-of-arc entry.)
+
+**Status:** MERGED. Branch `claude/lance-graph-ontology-review-Pyry3` → `main`. 1 doc commit (`a29946b`, rebased to resolve `AGENT_LOG.md` append-vs-append with #421) + merge commit (`984512b`). Read-only handover; zero `.rs` / `Cargo.toml` / `build.rs` / `data/` changes; 3 files; +310/-0.
+
+**Added:**
+- `.claude/handovers/2026-05-28-1200-pr-418-419-surreal-mailbox-baton-plan-map.md` (~310 LOC, 7 sections) — meticulously mapped handover. §1 PR #418 review (verdict + 3 substantive notes) · §2 SurrealDB role correction · §3 plan corpus map (8 plans + 9 epiphanies + dep chain + `TD-RESONANCEDTO-DUP-1`) · §4 PR #419 brief (unrelated to surreal/mailbox) · §5 navigability meta-finding · §6 action surface · §7 cross-refs.
+- `EPIPHANIES.md` ← `E-SURREAL-POC-UNANNOTATED-SUPERSEDURE` (FINDING / navigability) — records that the `.claude/surreal/` POC surfaces (15 docs + `RECONCILIATION_with_canonical_plan.md`) lack a supersedure pointer to the `E-RUBICON-RACTOR` ruling. Names the lowest-risk fix (a `.claude/surreal/SUPERSEDURE_NOTE_2026-05-27.md` pointer file) without performing it.
+- `AGENT_LOG.md` ← session row (post-rebase, sits chronologically after #421's AXIS-B entry).
+
+**Locked:**
+- **The SurrealDB role correction is the in-session ruling.** *"LanceDB is the leading store / source of truth (append-only, versioned). SurrealDB is one VIEW over it (the Rubicon kanban), never a store."* Originates in `E-RUBICON-RACTOR` + `.claude/plans/bindspace-singleton-to-mailbox-soa-v1.md` §2.7 (on PR #418 head, branch `claude/splat3d-cpu-simd-renderer-MAOO0`). Supersedes the older Zone-2 cold-store framing in `.claude/surreal/RECONCILIATION_with_canonical_plan.md:20`, the surreal POC, and `causaledge64-mailbox-rename-soa-v1` Zone 2. **Consequence locked:** `surreal_container` (BLOCKED A/B/C/D — fork dep + Lance 6 pin) is **optional**, NOT on the D-MBX-6 critical path; D-MBX-6's hot/cold transparent view uses the LanceDB cold tier directly.
+- **The two-figure footprint distinction is the canonical reading of the mailbox-SoA migration.** Bare migrated SoA columns ≈ 24–50 B/row vs full hot thought ≈ ~6 KB/row (content/topic/angle Hamming planes stay hot). The 64k–256k thought · 300–600 MB hot ceiling derives from the latter.
+- **`E-RUBICON-RACTOR` is honest CONJECTURE / framing-only.** Post-hoc psychological framing (Heckhausen action-phase + Libet "free won't") over the already-shipped Σ10 (D-CSV-10 #388 `SigmaTierRouter`). Nothing to implement from the epiphany itself; it's a naming/mapping.
+- **Read-only review = read-only PR.** A handover synthesising a review does not, by itself, mutate code or perform the navigability fix it identifies. The pointer-file follow-up is explicitly listed as out of scope so the contract holds.
+
+**Deferred:**
+- `.claude/surreal/SUPERSEDURE_NOTE_2026-05-27.md` pointer file (the lowest-risk fix the navigability finding names) — not done here so the read-only contract of #422 holds.
+- A sibling handover persisting the earlier-in-session `lance-graph-ontology` crate review + `UnifiedBridge` migration-status findings — the user chose "findings report only" for those during the session; not persisted unless re-requested.
+- The CLAUDE.md "The Click" doctrinal rewrite off `Vsa16kF32` (OQ-4) — gates D-MBX-5; explicitly not in scope.
+
+**Docs:**
+- `.claude/handovers/2026-05-28-1200-pr-418-419-surreal-mailbox-baton-plan-map.md` (new).
+- `EPIPHANIES.md` `E-SURREAL-POC-UNANNOTATED-SUPERSEDURE` (appended).
+- `AGENT_LOG.md` session row (appended).
+
+**Confidence (2026-05-28):** working — docs-only; merge clean (rebased onto post-#421 main; `EPIPHANIES.md` auto-merged; `AGENT_LOG.md` conflict resolved by keeping both entries chronologically; force-with-lease push). Merge commit `984512b`. No CI gates relevant.