feat(a): Store::open multi-schema — kei-chat-store sessions fully engine-owned
Breaking API change: Store::open(path, schemas: &[&EntitySchema])
replaces single-schema variant. All 6 callers migrated in same commit.
Engine changes:
- engine::run_migrations wraps ALL schemas in one unchecked_transaction
- Cross-schema atomicity: failing migration in schema[N] rolls back
schema[0..N-1] too. Verified via new failing_migration_rolls_back_
prior_schemas test.
Sister crates (5): trivial slice wrap in store.rs — 6 sites each,
~2 LOC delta.
kei-chat-store MAJOR change:
- Split CHAT_SCHEMA → MESSAGES_SCHEMA (INTEGER PK, FTS) + SESSIONS_SCHEMA
(TextPk UUID, TextArchiveEnum status 'active'|'archived', status_at +
message_count/total_tokens/total_cost aggregate cols)
- Drop chat_sessions DDL from custom_migrations (engine owns now)
- start_session → v_create::run(&SESSIONS_SCHEMA)
- archive_session → v_archive::run (writes 'archived' sentinel +
stamps status_at via TextArchiveEnum mode)
- get_session → v_get::run
- bump_session_totals stays bespoke (per-message aggregate UPDATE not
a generic CRUD op)
Substrate coverage kei-chat-store: ~60% → 100% (messages + sessions
both engine-owned).
Tests: 45 entity-store (was 42, +3 multi_schema_smoke: two-schema
creates, verbs dispatch per schema, rollback atomicity).
All sister crates preserved: task 9, chat 6, content 4, social 5,
crossdomain 5, sage 36.
Closes HANDOFF-WAKE's final architectural gap.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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