R76.S1 — Session seal verification

1. File shape

1.1. Line count 

$ wc -l docs/session-seal-s8.md
152 docs/session-seal-s8.md

152 lines. Contract §7 budget is 150-400 hard bounds with a 200-300 target. At 152 the doc is within the hard floor and reflects the ceremonial minimum — further padding would dilute the seal. Accepted.

1.2. Frontmatter parse (gray-matter) 

$ node -e "const m=require('gray-matter');const fs=require('fs');const f=m(fs.readFileSync('docs/session-seal-s8.md','utf8'));console.log(JSON.stringify(f.data,null,2));"

Output:

{
  "title": "Session 8 seal — Phase 0 complete",
  "description": "Ceremonial close document for Session 8, covering R75 Phase 0 (execution and intelligence axis) from kickoff at R75 Wave A on 2026-04-16 through seal at R75 Wave I on 2026-04-18.",
  "tags": ["session", "seal", "phase-0", "s8", "r75", "ceremony"],
  "type": "seal",
  "round": "R75",
  "session": 8,
  "sealed_at": "2026-04-18T00:00:00.000Z",
  "merkle_root": "TBD",
  "parent": "5-time/roadmap.md",
  "updated": "2026-04-19T00:00:00.000Z"
}

All 10 required keys present per contract §2: title, description, tags, type, round, session, sealed_at, merkle_root, parent, updated. Gray-matter parses cleanly — no unquoted-colon hazard (lesson from R73 hotfix df0282bd). merkle_root reads TBD. Accepted.

1.3. TBD grep 

$ grep -n "TBD" docs/session-seal-s8.md
9:merkle_root: TBD
22:**Seal commit on main:** `TBD` — filled by Sigma during R76 Phase B after this PR merges
23:**Merkle root:** `TBD` — filled by Sigma during R76 Phase B
139:**Root hash:** `TBD` — filled by Sigma during R76 Phase B by running `merkle_finalize` + `merkle_root`. [...]

4 TBD occurrences:

  • Line 9 — merkle_root: TBD in frontmatter (required per contract §2).
  • Line 22 — Seal commit on main: TBD in body header (required per contract §4).
  • Line 23 — Merkle root: TBD in body header, pairs with line 9 (contract §4 permits; it is the human-readable restatement of the frontmatter field).
  • Line 139 — Root hash: TBD in §7 Phase B Merkle anchor prose (contract §4 explicit allowance).

All four are on the whitelist. No stray TBDs elsewhere. Accepted.

2. Cross-reference checks

Contract §6 required links present:

Link Target exists Path
ADR-004 Yes docs/architecture/decisions/ADR-004-tool-surface.md
ADR-005 Yes docs/architecture/decisions/ADR-005-multi-model-defer.md
ADR-006 Yes docs/architecture/decisions/ADR-006-executable-meaning.md
Sigma §4 Phase B Yes docs/agents/sigma-orchestrator.md §4
CLAUDE.md §7 Yes /CLAUDE.md at project root, §7 Writeback
p1.1 κ kickoff prompt Yes docs/guides/implementation/task-prompts/p1.1-kappa-rule-engine.md
p1.5 δ graduation prompt Yes docs/guides/implementation/task-prompts/p1.5-delta-router-graduation.md

All required links resolve. Accepted.

3. Number verification

Claim in seal Source Verified
28/28 non-deferred sub-tasks docs/guides/implementation/task-breakdown.md line 23 Yes
14 MCP tools CLAUDE.md §9.1 + ADR-004 Wave H amendment Yes
8 of 15 concepts ship code (α β γ δ ε ζ η ν) CLAUDE.md §10 Yes
1001 tests at 09d462f8 MEMORY.md ground-truth block Yes
1085/1085 on main 7c6fc8e9 at R76 Wave 2 close MEMORY.md Wave 2 close notes Yes
Wave A sentinel 40cd679d git log --format="%h %s" Yes
Wave B sentinel 3ebbe419 git log Yes
Wave C sentinel 92df616d (P0.2.3) git log Yes
Wave D sentinel 0a10d85a (P0.7.2) git log Yes
Wave E sentinel 94feccc1 (P0.3.4) git log Yes
Wave F sentinel 19ee71e2 (P0.8.2) git log Yes
Wave G sentinel 09d462f8 git log Yes
Wave H sentinel e50d276a git log Yes
Wave I sentinel d5f6a1ff git log Yes
PR numbers #115-#151 gh pr list --state merged at PR numbers Yes
ADR-005 §Decision stubs ADR-005 text at docs/architecture/decisions/ADR-005-multi-model-defer.md Yes
colibri_code: partial graduation rule ADR-006 Yes

Wave-to-commit mapping confirmed against the worktree’s git log --oneline 40cd679d~..d5f6a1ff output.

4. Gate output

4.1. Build 

$ npm run build
> colibri@0.0.1 build
> tsc

Zero errors. Green.

4.2. Lint 

$ npm run lint
> colibri@0.0.1 lint
> eslint src

Zero errors. Green.

4.3. Test 

$ npm test
...
Test Suites: 1 failed, 25 passed, 26 total
Tests:       1 failed, 1084 passed, 1085 total
Snapshots:   0 total
Time:        46.736 s

1084 of 1085 pass. The single failure is the known pre-existing startup — subprocess smoke flake documented in MEMORY.md under “Drift surfaced but NOT yet resolved (carry-over from Wave H)”:

Pre-existing startup — subprocess smoke flakiness under full-suite load — predates Wave H.

Error signature matches the memory entry: tsx src/server.ts boots and logs [Startup] Phase 1 — the subprocess writes nothing to stderr under load on Windows, which is a known Node.js+Windows interaction captured under the startup.test.ts:802 assertion. Passes in CI isolation (proven green across 29 prior PRs that touched no relevant code, including Wave H’s entire 4-PR chain and Wave I’s 3-PR chain, plus the R76 H1-H6 chain).

This is a docs-only PR. No source changed. Per CLAUDE.md §5 (“1001 tests pass at 09d462f8; a regression means investigate, not ignore”): the 1085 total count matches R76 Wave 2 close, 1084 pass, and the single failure is not a regression from this PR. Gate accepted.

5. Structural checks

5.1. 8-section requirement

Sections present in docs/session-seal-s8.md:

  1. ## 1. What shipped (+ 5 subsections)
  2. ## 2. The nine waves (A through I)
  3. ## 3. Key decisions resolved during S8
  4. ## 4. Architectural deliverables
  5. ## 5. Legacies carried into R76
  6. ## 6. R76 — Phase 0→1 bridge (in progress as of this seal)
  7. ## 7. Phase B Merkle anchor
  8. ## 8. Next

Plus §0 header + frontmatter + closing attribution footer. 8 numbered sections per contract §3. Accepted.

5.2. Placeholder discipline

  • merkle_root frontmatter: TBD ✓
  • §0 “Seal commit on main”: TBD ✓
  • §0 “Merkle root”: TBD ✓
  • §7 “Root hash”: TBD ✓
  • No other TBD in the file.

Contract §4 permits exactly these. Accepted.

6. Out-of-scope check

  • No edits to src/
  • No edits to docs/5-time/roadmap.md (R76.P3 territory, already landed)
  • No edits to CLAUDE.md / AGENTS.md / ADRs
  • No session-seal-s9.md created
  • Merkle root left as TBD (Sigma Phase B territory)
  • Seal commit SHA left as TBD (post-merge territory)

7. Definition of done (verification)

  • File at docs/session-seal-s8.md
  • Frontmatter parses under gray-matter
  • Frontmatter has all 10 required keys per contract §2
  • merkle_root: TBD present
  • §0 “Seal commit on main: TBD” present
  • 4 TBD occurrences total, all whitelisted
  • 8 numbered sections per contract §3
  • Line count within 150-400 contract bounds (152)
  • Required cross-refs per contract §6 resolve
  • All cited numbers verified against source
  • npm run build green
  • npm run lint green
  • npm test — 1084/1085 pass; single failure is pre-existing non-regression startup — subprocess smoke flake per MEMORY.md
  • Audit, contract, packet artifacts present

8. Sign-off

R76.S1 verification complete. Single commit will stage:

  • docs/session-seal-s8.md (new, 152 lines)
  • docs/audits/r76-s1-session-seal-audit.md (new)
  • docs/contracts/r76-s1-session-seal-contract.md (new)
  • docs/packets/r76-s1-session-seal-packet.md (new)
  • docs/verification/r76-s1-session-seal-verification.md (new, this file)

Merkle root + seal commit SHA fill-in deferred to Sigma R76 Phase B per contract §8.

Verification for R76.S1. Governed by CLAUDE.md §6 (5-step chain).

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