R76.S1 — Session seal audit

1. Scope

Create docs/session-seal-s8.md — the ceremonial close document for Session 8, which is coterminous with R75 Phase 0. The file establishes the new seal record after both previous seals (s5, s6) were deleted in R75 sub-phase 4C per PLAN-RED KILL list (a1ba6913 — “chore(docs): R75 sub-phase 4C — delete KILL list per PLAN-RED”).

This task does NOT fill in the Merkle root — that is Sigma’s job in R76 Phase B, after audit_verify_chain + merkle_finalize.

2. Inventory — existing seal artifacts

2.1. Current tree 

$ ls docs/session-seal*
ls: cannot access 'docs/session-seal*': No such file or directory

No docs/session-seal-*.md file exists on origin/main (7c6fc8e9). This PR is the first session seal after the R75 KILL list wipe.

2.2. Historical precedent (deleted)

File Added commit Deleted commit Session
docs/session-seal-s5.md cb47c78e (2026-04-08) a1ba6913 (2026-04-16) S5 (R43-R52)
docs/session-seal-s6.md 23c26ae6 (R73) a1ba6913 (2026-04-16) S6 (R53-R73)

The s6 format (peer-reviewed during R73) is the nearest precedent. Its frontmatter keys: title, description, tags, type: seal, session, rounds, round, parent, status: sealed, updated. The section structure proceeded: intent → rounds in order → deliverables → Merkle root → next. The new S8 seal inherits that shape but adapts to Phase 0’s wave-based execution model (A-I waves, not R-numbered sub-rounds).

2.3. Naming convention this PR establishes

  • docs/session-seal-s<N>.md — <N> is the session index (0-indexed from S0 if retroactive, but memory uses 1-indexed S5/S6/S7/S8).
  • Memory convention: S8 = R75 close. S7 closed R74; S6 sealed R53-R73; S5 sealed R43-R52.
  • Future sessions: S9+ file created at each session close by that round’s Sigma.

3. Phase 0 journey inventory (Waves A-I)

From git log --oneline 40cd679d~..d5f6a1ff:

3.1. Wave-to-commit mapping

Wave Date (2026-04) Theme Sentinel commit(s) PR range
A -16 P0.1.3 CI + P0.4.1 modes + P0.2.1 α server bootstrap 462b0feb, a64d7349, 40cd679d #115, #116, #117, #118, #119, #120
B -16 P0.2.2 SQLite init (WAL + FK + migrations) 3ebbe419 #122
C -17 4-parallel: P0.2.3 startup + P0.3.1 task FSM + P0.6.1 ε schema + P0.7.1 ζ trail schema 92df616d, b8a036a6, cf1250ca, 6c26bb58 #123, #124, #125, #126
D -17 4/4 task PRs + hygiene; P0.2.4, P0.3.2, P0.6.2, P0.7.2 cb9befaf, 6e443196, f45abe65, 0a10d85a, 28ddcc25 #129, #130, #131, #132, #133
E -17 First η surface + rename chore + β writeback enforcement + γ shutdown d18f1272, 5eadde8b, 6d778a6c, 94feccc1, dc660381 #134, #135, #136, #137, #138
F -17 η three-zone retention + ν starter wrappers 19ee71e2, e644ba00, 319e46e4 #139, #140, #141
G -17 η tools + ζ audit_verify_chain CLOSE + ν MCP bridge 21e199cb, 922e9c4b, 09d462f8 #142, #143, #144
H -18 ε capability index CLOSE + doc reconciles (3 PRs) f4286485, 5e59250b, d4c94ea7, e50d276a #145, #146, #147, #148
I -18 δ scoring stub + δ fallback stub + reconcile to 28/28 5a3eb10f, a22dd23e, d5f6a1ff #149, #150, #151

3.2. Sub-task coverage (28/28)

Verified against docs/guides/implementation/task-breakdown.md line 23: “Phase 0 is 28 sub-tasks numbered P0.1.1 – P0.9.3.”

Group Count Concept Status
P0.1 4 (.1-.4) Infrastructure Shipped
P0.2 4 (.1-.4) α System Core Shipped
P0.3 4 (.1-.4) β Task Pipeline Shipped
P0.4 2 (.1-.2) γ Server Lifecycle Shipped
P0.5 2 (.1-.2) δ Model Router stubs Shipped (library-only per ADR-005)
P0.6 3 (.1-.3) ε Skill Registry Shipped
P0.7 3 (.1-.3) ζ Decision Trail Shipped
P0.8 3 (.1-.3) η Proof Store Shipped
P0.9 3 (.1-.3) ν Integrations Shipped (library-only)
Total 28 — 28/28

4. Key facts to assert in the seal doc

  1. Phase 0 SEALED at 28/28 non-deferred as of d5f6a1ff (Wave I merge, 2026-04-18).
  2. 14 MCP tools shipped (ADR-004 R75 Wave H amendment): 5 β + 4 ζ + 2 η + 1 ε + 2 system.
  3. 8 of 15 Greek concepts ship code at colibri_code: partial per ADR-006: α β γ δ ε ζ η ν.
  4. 7 concepts remain colibri_code: none: θ ι κ λ μ ξ π — spec-only for later phases.
  5. Tests: 1001 at 09d462f8 (Wave G close), +25 from P0.6.3, +16 from P0.5.1, +33 from P0.5.2, +10 from R76 H5/H6 → 1085/1085 at R76 Wave 2 close.
  6. Stack: TS 5.3+ · MCP SDK · Zod 3.23 (not 4, despite task-breakdown.md line 15 still saying Zod 4) · better-sqlite3 · merkletreejs 0.6.0 · gray-matter · Jest ESM. Chevrotain is spec-only for Phase 1+ κ.
  7. Seal commit on main: TBD — this field fills in after this PR merges (via git log post-merge, captured by Sigma during R76 Phase B).
  8. Merkle root: TBD — this field fills in by Sigma during R76 Phase B.

5. Key decisions resolved during Session 8

Drawn from memory + CLAUDE.md §9.1 footnotes:

  1. server_info phantom → STRUCK (ADR-004 R75 Wave H amendment); was never in task-breakdown; locked numbering forbade adding it.
  2. task_update vs task_transition → KEPT MERGED; state-machine validation lives internally in src/domains/tasks/state-machine.ts.
  3. ANTHROPIC_API_KEY → validated at call-time per Design Invariant 5 in src/config.ts:66-94, not at server startup.
  4. Wave I δ stubs → ADR-005 §Decision was misread as “defer entirely”; corrected mid-round to “ship Phase 0 library stubs per §Decision”; P0.5.1/P0.5.2 shipped as stubs in PRs #149/#150.

6. Architectural deliverables shipped

From CLAUDE.md §9.1 and the shipped directory tree:

  • src/server.ts — MCP entry with inlined 5-stage α middleware wrapper (P0.2.1 + P0.2.4).
  • src/db/index.ts + src/db/schema.sql — better-sqlite3 WAL + FK with migrations (P0.2.2).
  • src/domains/tasks/ — β FSM (INIT → GATHER → ANALYZE → PLAN → APPLY → VERIFY → DONE + CANCELLED) + 5 MCP tools (P0.3.1-4).
  • src/domains/skills/ — SKILL.md loader + capability index + skill_list tool (P0.6.1-3).
  • src/domains/trail/ — hash-chained thought records + audit_verify_chain (P0.7.1-3). Directory name is trail, not thought.
  • src/domains/proof/ — merkletreejs-backed tree + merkle_finalize + merkle_root (P0.8.1-3). Directory name is proof, not merkle.
  • src/domains/integrations/ — library-only Claude API + MCP bridge + notifications (P0.9.1-3).
  • src/domains/router/ — library-only δ stubs (P0.5.1-2), constant-returns-claude scorer + single-member fallback.

7. Legacies into R76

Per MEMORY.md:

  • startup — subprocess smoke flake under local full-suite load (passes isolated in CI)
  • merkletreejs missing @types
  • .claude/settings.local.json persistent drift
  • Colibri MCP writeback queued (no live MCP client)
  • Cross-worktree leak root cause from Wave C not diagnosed

8. Acceptance criteria for the deliverable file

  • File lives at docs/session-seal-s8.md
  • YAML frontmatter parses (gray-matter compatible)
  • Frontmatter includes: title, description, tags, type: seal, round: R75, session: 8, sealed_at: 2026-04-18, merkle_root: TBD, parent, updated: 2026-04-19
  • Merkle root field reads TBD (Sigma fills in Phase B)
  • Seal commit on main reads TBD (captured post-merge)
  • File length in the 200-300 line range
  • 8 sections per the task prompt template
  • Cross-references to real files: ADR-004, ADR-005, ADR-006, docs/agents/sigma-orchestrator.md, CLAUDE.md §7, docs/guides/implementation/task-prompts/p1.1-kappa-rule-engine.md, docs/guides/implementation/task-prompts/p1.5-delta-router-graduation.md
  • Gate: npm run build && npm run lint && npm test green (docs-only; no-op)

9. Out of scope

  • No changes to src/
  • No changes to docs/5-time/roadmap.md (R76.P3 territory, already landed)
  • No changes to CLAUDE.md §9.1 / §10 (R75 Wave I territory, already landed)
  • No creation of session-seal-s9.md (R77+ territory)
  • No merge operations, no force-push
  • No filling the Merkle root (Sigma Phase B)

Audit for R76.S1. Governed by CLAUDE.md §6 (5-step chain) and docs/agents/sigma-orchestrator.md §4 Phase B.

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