feat(alerts): publish reconciliation quantity mismatches to trex-notifier (req-0007/ac-0024)

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

trex_core/adapters/persistence/sql/026_create_reconcile_notification_state.sql

@@ -0,0 +1,16 @@
+-- req-0007 / ac-0024: durable mismatch notification lifecycle state.
+-- PK: identity_key (slot_id TEXT for B-case; "{instance_key}\x00C\x00{symbol}" for C-case).
+-- lifecycle_state: 'notified' | 'pending_resolved'.
+-- ON CONFLICT DO UPDATE: replay-safe; re-running migration is a no-op.
+CREATE TABLE IF NOT EXISTS reconcile_notification_state (
+    identity_key    TEXT        PRIMARY KEY,
+    case_code       TEXT        NOT NULL CHECK (case_code IN ('B', 'C')),
+    instance_key    TEXT        NOT NULL,
+    symbol          TEXT        NOT NULL,
+    quantity_a      INTEGER     NOT NULL,
+    quantity_b      INTEGER     NOT NULL,
+    lifecycle_state TEXT        NOT NULL
+        CHECK (lifecycle_state IN ('notified', 'pending_resolved')),
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now()
+);