docs(handover): PR #418/#419 review + surreal/mailbox/Baton/SoA-as-BindSpace-surrogate plan map

.claude/board/AGENT_LOG.md

@@ -530,3 +530,20 @@ PROCESS NOTE: subagents cannot use the Write tool or cat>/printf> here (interact
 HAND-BACK: green light for lance-graph to implement the 5 Reasoner impls (CustomerCategory/
 PostingAnomaly/NextBestAction/Other) against the filled contracts. NEEDS-INPUT savants can be
 impl'd with gap columns nullable + structurally-capped confidence until feeds land.
+## 2026-05-28 — [main-thread / Opus] [HANDOVER ONLY — no code, no behavioral change] PR #418/#419 review + surreal/mailbox/Baton plan map
+
+**Branch:** `claude/lance-graph-ontology-review-Pyry3`. **Scope:** read-only PR review pass on lance-graph #418 + #419, synthesis of the in-session plan corpus around the owned little-endian Baton contract / mailbox-as-owner / SoA-as-BindSpace-surrogate / SurrealDB-as-view.
+
+**Deliverables (this commit):**
+- `.claude/handovers/2026-05-28-1200-pr-418-419-surreal-mailbox-baton-plan-map.md` — meticulously mapped handover doc: PR #418 review (verdict + 3 substantive notes), PR #419 review (brief, scope clarification), the SurrealDB role correction (`Zone-2 cold store` → `view over leading LanceDB`), the plan corpus map (8 plans + 9 epiphanies + dep chain), the navigability meta-finding (§5), action surface (§6), cross-refs (§7).
+- `EPIPHANIES.md` ← `E-SURREAL-POC-UNANNOTATED-SUPERSEDURE` (this commit). Navigability FINDING: the `.claude/surreal/` POC docs lack a supersedure pointer to `E-RUBICON-RACTOR` + plan §2.7; lowest-risk fix is a non-mutating pointer file (not done in this commit).
+
+**PRs reviewed:**
+- #418 (`docs: BindSpace-singleton → mailbox-owned SoA migration spec`) — verdict **sound, merge-ready as a spec**. Exemplary CCA2A hygiene (plan + INTEGRATION_PLANS + STATUS_BOARD + 2 EPIPHANIES + TECH_DEBT in one PR, append-only). 3 substantive notes: (a) the bare-columns ~24–50 B vs full-hot-thought ~6 KB distinction is in the plan but conflatable; (b) `E-RUBICON-RACTOR` is honest CONJECTURE — post-hoc psychological framing over already-shipped Σ10 (D-CSV-10 #388), nothing to implement; (c) the OQ-4 doctrinal contradiction (CLAUDE.md "The Click" on `Vsa16kF32`) is correctly *gated*, not silently resolved — S5 (delete cycle plane) blocked until the doctrinal rewrite lands.
+- #419 (`docs(odoo-savants): 25 AXIS-B evidence contracts`) — unrelated to surreal/mailbox; low merge risk; dispatch decision (one `Reasoner` impl per `ReasoningKind`) is reasonable. The real gate for D-ODOO-SAV-4 (impl) is the 14 `NEEDS-INPUT` blockers (woa-rs feeds + lance Layer-2 alignment axioms).
+
+**Tests / build:** none run in this handover (docs only). The reviewed PRs are themselves docs-only.
+
+**No code path changed. No `.rs` / `Cargo.toml` / `build.rs` / `data/` touched. Read-only review + appends + one new handover doc.**
+
+**Cross-ref:** PR #418 (open), PR #419 (open), `EPIPHANIES.md` `E-RUBICON-RACTOR` + `E-MAILBOX-IS-BINDSPACE` + `E-SURREAL-POC-UNANNOTATED-SUPERSEDURE`, plans listed in §3 of the handover doc.

.claude/board/EPIPHANIES.md

@@ -5269,3 +5269,20 @@ Cross-ref: W2's sprint-2 deliverable (Tier-0 "what's shipped" index); `.claude/p
 ---
 
 **Append-only governance preserved.** No prior epiphany text was edited by this section. 17 dated entries appended under the single section header `2026-05-07 — Unified OGIT Architecture: 15-pattern synthesis (sprint-2)`. The 16th and 17th entries (PHENOMENOLOGY-16 and RECOGNITION-OVER-DESIGN-17) extend the original 15-pattern brief because they emerged in the same turn-16 synthesis and are structurally inseparable from the rest — the title retains "15-pattern" as the sprint label, with the count of distinct epiphanies being 17.
+
+## 2026-05-28 — E-SURREAL-POC-UNANNOTATED-SUPERSEDURE — the `.claude/surreal/` POC docs read as if SurrealDB is the persistence target; the 2026-05-27 ruling that LanceDB is the *leading* store and SurrealDB is one *view* over it is recorded only in `E-RUBICON-RACTOR` + plan `bindspace-singleton-to-mailbox-soa-v1` §2.7 — readers landing in `.claude/surreal/` first do not see it
+
+**Status:** FINDING / navigability (no architectural decision; no code change). The supersedure itself is the FINDING-grade work of #418 + `E-RUBICON-RACTOR`; this entry records that the older POC surfaces are **unannotated** with that pointer, which is a discoverability gap, not a correctness gap.
+
+**The unannotated surfaces (read-only audit):**
+- `.claude/surreal/RECONCILIATION_with_canonical_plan.md:20` — row *"SurrealDB-on-Lance persistence | Zone 2 `lance-graph-callcenter` + AriGraph SPO-G quads"* still names SurrealDB as the persistence home.
+- `.claude/surreal/cognitive-substrate.md` — substrate framing predates the LanceDB-leading ruling.
+- `.claude/surreal/01_deps_substrate.md` … `12_clean_writer_invariants.md` — the 12-task POC reads as if SurrealDB is the persistence target; `surreal_container` (SurrealDB-on-`kv-lance`) framing.
+
+**The current ruling these surfaces lack a pointer to:** *"LanceDB is the leading store / source of truth (append-only, versioned). SurrealDB is one VIEW over it (the Rubicon kanban), never a store."* — `EPIPHANIES.md` `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`).
+
+**Lowest-risk fix (NOT done in this handover):** add a non-mutating pointer file (e.g. `.claude/surreal/SUPERSEDURE_NOTE_2026-05-27.md`) that names `E-RUBICON-RACTOR` + plan §2.7 as the current ruling. The append-only governance leaves the existing lines intact; the pointer file is the discoverability surface.
+
+**Practical consequence (do not let this drift back):** `surreal_container` (BLOCKED A/B/C/D — fork dep + Lance 6 pin) is **optional**, not on the critical path for D-MBX-6. D-MBX-6's hot/cold transparent view uses the LanceDB cold tier directly; the SurrealDB kanban is a *second* view over the same LanceDB rows.
+
+**Cross-ref:** `E-RUBICON-RACTOR` (current ruling), `E-MAILBOX-IS-BINDSPACE` (§2.7 of the plan it gates), `E-BATON-1` (the LE-contract anchor), `.claude/plans/causaledge64-mailbox-rename-soa-v1` (driver plan that subsumes the surreal POC), `.claude/handovers/2026-05-28-1200-pr-418-419-surreal-mailbox-baton-plan-map.md` §5 (the audit source for this entry).