Fix critical session persistence bug in new-hook (#224)

* Fix critical session persistence bug in new-hook

Restores the second POST call to /sessions/:sessionDbId/init that was
incorrectly removed as "duplicate" in the hooks refactor.

The two POST calls serve different purposes:
- POST /api/sessions/init: Creates DB session, saves prompt (no SDK agent)
- POST /sessions/:sessionDbId/init: Starts the SDK agent session

Without the second call, the SDK agent never started, causing:
- First prompts saved to DB but never processed
- Subsequent prompts queued but no agent running to consume them
- Each new prompt creating orphaned sessions instead of continuing

This fix restores proper session continuation across multiple prompts.

Fixes conversation fragmentation reported in production.

* updated agent-sdk

* Skip meta-observations for session-memory file operations

Added a check to skip meta-observations when file operations (Edit, Write, Read, NotebookEdit) are performed on session-memory files. If the file path includes 'session-memory', a debug log is generated and the response indicates that the observation was skipped.

package.json

@@ -47,7 +47,7 @@
     "usage:today": "node scripts/analyze-usage.js $(date +%Y-%m-%d)"
   },
   "dependencies": {
-    "@anthropic-ai/claude-agent-sdk": "^0.1.27",
+    "@anthropic-ai/claude-agent-sdk": "^0.1.62",
     "@modelcontextprotocol/sdk": "^1.20.1",
     "ansi-to-html": "^0.7.2",
     "better-sqlite3": "^12.5.0",