Phase 4 of SP28 (Ack↔Claim Auto-Link). Refactors the per-AK2
helpers in cyclone.claim_acks to return ClaimAckLinkRow dataclasses
instead of mutating the session directly — the orchestrator (the
999 / 277CA / TA1 handlers + the matching parse-* API endpoints)
now persists each row via cycl_store.add_claim_ack so the
publish-from-store contract owns the live-tail event emission.
* handle_999 / handle_277ca / handle_ta1 — build batch envelope
index outside the work session (SQLite + concurrent sessions
causes 'database is locked'), call apply_X to get
ClaimAckLinkRow dataclasses, snapshot the rows before committing
the work session, then call cycl_store.add_claim_ack per row
in fresh sessions.
* /api/parse-999 / /api/parse-277ca / /api/parse-ta1 — mirror the
handler chain with event_bus passed through so live-tail
subscribers on the claim and ack sides see the new rows the
moment they land. Adds a 'claim_ack_links_count' field to each
ack response (spec §4).
* lookup_claims_for_ack_set_response — now accepts either a
callable OR a plain dict as batch_envelope_index (the store
returns a dict; tests pass callables).
* test_apply_claim_ack_links.py — 15 tests updated to assert on
the dataclass shape and exercise the full helper→add_claim_ack
cycle (so idempotency is verified at the store layer).
* test_e2e_999_to_claim_drawer.py — 2 new tests covering the
D10 two-pass join end-to-end via FastAPI TestClient (Pass 1
via ST02 + Pass 2 via PCN fallback).
Nora