docs(canonical): add client-spec-v2 pin + sync worldtree conversation-api canonicals
Operator decision A (client-spec tracking): add a first-class pin for docs/conversation-api-client-spec-v2.md (v2.1, sha 1ff1d73a — the client-facing spec our #371 parity pass shaped), vendored as a consumer copy, tolerate_drift=true (prose reference; OpenAPI+SSE stay the gates). canonical_sync is whole-manifest (no per-pin scope), so it also brought two independently-drifted pins current: - OpenAPI hard-gate 36148179 (2.3.0) -> 1c801547. Additive-only within the FROZEN v1 wire (Worldtree #326) — no code/SDK breakage; the SDK targets 2.3.0 and still works against the newer additive surface. - conversation-api-spec.md (full prose) -> f6e964ec (v1.3+). canonical_drift now exits 0. FOLLOW-UP (non-urgent): the OpenAPI moved, so a coverage-map re-audit against the new surface would surface any new in-scope I/O points worth consuming (ratatoskr v1 = full WT I/O coverage). Release-only cadence: no tag.
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