chore: bump version to 0.0.19 and add release notes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jlia0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tinyagi",
-  "version": "0.0.18",
+  "version": "0.0.19",
   "description": "Multi-agent, multi-team, multi-channel 24/7 AI assistant",
   "workspaces": [
     "packages/*"

releases/v0.0.19.md

@@ -0,0 +1,11 @@
+## TinyAGI v0.0.19
+
+### Bug Fixes
+- Fixed scheduled messages not being persisted to the `agent_messages` table, ensuring scheduled content is properly stored and retrievable (#259)
+- Resolved `signalDone` grace period race condition in invoke flow that could cause premature completion (#258)
+- Fixed proactive messages not being delivered immediately by emitting SSE events so channels pick them up without polling delay (#257)
+
+### Changelog (since v0.0.18)
+- 05c722b fix(schedules): persist scheduled messages to agent_messages table (#259)
+- afd2730 fix(invoke): resolve signalDone grace period race condition (#258)
+- fb29830 fix(channels): emit SSE event for proactive messages so channels deliver immediately (#257)