v2.9.34 — audit-ledger closure wave

Closes 4 of 7 carryover items from AUDIT_LEDGER_v2.9.34.md plus HS3
(missing CLAUDE.md operating contract):

- HS3 / CLAUDE.md operating contract (repo root)
- #9 / alert investigation (23 alerts triaged)
- #10 / 1k DAG fixture with branching/merging
- #16 / cryptographic signoff stub + schema v2 wire format
- #17 / SOP checklist schema + validator

Partial close — #6 P6 expected-value (engineering scaffolding only;
P6-values portion stays user-blocked).

Engine math unchanged from v2.9.33; crossval 747/747 holds.

See CHANGELOG.md v2.9.34 entry for the full breakdown.

v2.9.33 — audit-response pass 2 (closes 14 of 19 findings)

v2.9.32 — audit-response wave + version-drift regression gate

v2.9.31 — Forensic Strict Mode (court-grade run gate)

v2.9.30 — Daubert verification packaging + coverage + calendar citations

v2.9.29 — adversarial-audit second-pass residual cleanup

v2.9.28 — adversarial-audit response (Daubert disclosure hygiene)

v2.9.27 - audit closeout (13 items); crossval 444->747; v2.9.x wave c…

…omplete

v2.9.26 - provenance sidecars + citation polish

v2.9.25 - perf wave (4 items)