Release v0.2.1

• Fixed PostgreSQL source install guidance to point to agora-etl-plugins[postgres]
• Hardened Redis DLQ iteration so bounded reads stop early and avoid loading the full DLQ index at once
• Improved Redis state TTL precision with millisecond-expiry writes and safer handling of already-expired keys
• Reduced Redis semantic dedup scan pressure by switching embedding lookups from full-set reads to incremental SSCAN batches
• Fixed PostgreSQL schema-adapter introspection for schema-qualified tables such as analytics.users
• Hardened Kafka source and sink startup/shutdown recovery so serializer or deserializer lifecycle is rolled back on startup failure and best-effort cleanup still runs during teardown errors
• Fixed Confluent schema registry requests to URL-encode subject path segments safely
• Expanded regression coverage for distributed coordination, Kafka recovery paths, Redis DLQ iteration, Redis TTL semantics, Redis embedding dedup scans, and PostgreSQL schema-adapter introspection