docs(board): append 2026-05-06 session findings to ARCHITECTURE_ENTROPY_LEDGER

Append-only update to the entropy ledger per its own Update Protocol.
Records:

State changes:
- WATCHER-1: Stalled → Wired (sync, std-only) per topology I-2.
  Evidence: PR #337 (commit c1fc1e5). Transport layer correct;
  MVCC bind to Dataset::checkout_latest().version() still pending.
  Entropy 4 → 3.
- POLICY-1 / MEMBRANE-GATE-1: Stalled → Wired on BOTH consumer sides
  via newtype-bridge pattern. SMB side (smb-office-rs#29 — SmbMembraneGate
  over Arc<lance_graph_rbac::Policy>) + medcare side (medcare-rs#98 —
  MedCareMembraneGate over Arc<medcare_rbac::Policy>, with 12+3 agent
  sprint trail at .claude/board/sprint-log/). 4 CRITICAL fixes applied
  during sprint (BMV-Ä §57 Anamnese append-only, receptionist clinical-
  blind safety, StepDomain::Medcare casing + HIPAA values, policy.rs
  test alignment). Entropy 4 → 2 / 3 → 2.
- SPLAT-1: stage advance via PR #336 + #344. 22 splat tests now passing.

New rows:
- CYCLE-ACCUM-1: per-cadence flush gate, distinct from collapse_gate
  per topology I-4. Wired in PR #337 with 11 tests. Entropy 2.
- LADYBUG-EQUIV-1: ladybug-rs ↔ lance-graph equivalence closure.
  Documented mapping (clam_path ≅ cam_pq, nsm_substrate ≅ deepnsm,
  sentence_crystal ≅ holograph, DN-tree binding ≅ holograph::dntree,
  etc.). Verdict: harvest empty. Entropy 1 (clean closure).

Workspace crate inventory expansion: prior models tracked ~5 crates;
canonical inventory is ~22 (lance-graph + lance-graph-contract +
lance-graph-planner + lance-graph-callcenter + lance-graph-rbac +
lance-graph-archetype + lance-graph-catalog + lance-graph-cognitive +
cognitive-shader-driver + deepnsm + holograph + bgz-tensor +
highheelbgz + reader-lm + jc + thinking-engine + neural-debug +
learning + causal-edge + medcare-rs/{medcare-rbac,medcare-realtime,...} +
smb-office-rs/{smb-realtime,...} + q2/cockpit-server).

Cross-references: .claude/patterns.md (NEW, commit cd95da9) — graph-
traversal usability guide. SINGLE_BINARY_TOPOLOGY.md — three-layer
invariants. MEDCARE_POLICY_GAP.md — scoping. CROSS_REPO_PRS.md —
append-only external-repo log. sprint-log/ — 12+3 agent sprint trail.

Open seams: 8 → 5 (3 closed via PR #337 + #29 + #98).

Pre-work checklist for future sessions added — the load-bearing surface
that prevents the discovery-loop cost this session paid (~10 rounds of
"is X new?" → "no, X exists at Y").

[Note: this branch's pre-existing ledger state was stale; this commit
writes [main_content + 2026-05-06 dated append] so the user-side merge
keeps everything from main plus the new section.]

Author: AdaWorldAPI