adapter-sqlite: all repo implementations + wire fn + migrations copy

migrations_sqlite/20260317000000_add_activity_log.sql

@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS activity_log (
+    id TEXT PRIMARY KEY NOT NULL,
+    timestamp TEXT NOT NULL,
+    event_type TEXT NOT NULL,
+    detail TEXT NOT NULL,
+    channel_id TEXT
+);
+
+CREATE INDEX IF NOT EXISTS idx_activity_log_timestamp ON activity_log(timestamp DESC);