fix(intent): mirror 'expired' status predicate in roux_ingest ON CONFLICT (#117)

PR #115 / migration 0018 added `AND status <> 'expired'` to the partial
unique index `cc_intents_roux_ingest_message_id_uidx` but did not update
the upsert's ON CONFLICT WHERE clause in createRouxIngestIntentIdempotent.

PostgreSQL requires predicate equality to match an index to ON CONFLICT —
the mismatch caused the upsert to fail with "no unique or exclusion
constraint matching the ON CONFLICT specification", breaking the Roux
ingest path. Verified against a fresh Neon branch:
  - pre-fix: SQLSTATE 42P10 (no matching constraint)
  - post-fix: ON CONFLICT resolves cleanly to the index

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: chitcommit

meta/intent.ts

@@ -279,6 +279,7 @@ export async function createRouxIngestIntentIdempotent(
     ON CONFLICT ((payload->'source'->>'message_id'))
       WHERE intent_type = 'roux_ingest'
         AND payload->'source'->>'message_id' IS NOT NULL
+        AND status <> 'expired'
       DO NOTHING
     RETURNING *`;
   if (inserted[0]) {