fix(session): Semantic renaming and memory session ID capture for resume

This commit fixes the session ID confusion identified in PR #475:

PROBLEM:
- Using contentSessionId (user's Claude Code session) for SDK resume was wrong
- Memory agent conversation should persist across the entire user session
- Each SDK call was starting fresh, losing memory agent continuity

SOLUTION:
1. Semantic Renaming (clarity):
   - claudeSessionId → contentSessionId (user's observed session)
   - sdkSessionId → memorySessionId (memory agent's session for resume)
   - Database migration 17 renames columns accordingly

2. Memory Session ID Capture:
   - SDKAgent captures session_id from first SDK message
   - Persists to database via updateMemorySessionId()
   - SessionManager loads memorySessionId on session init

3. Resume Logic Fixed:
   - Only resume if memorySessionId captured from previous interaction
   - Enables memory agent continuity across user prompts

Files changed: 33 (types, database, agents, hooks, routes)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/services/worker/validation/PrivacyCheckValidator.ts

@@ -12,20 +12,20 @@ export class PrivacyCheckValidator {
    * Check if user prompt is public (not entirely private)
    *
    * @param store - SessionStore instance
-   * @param claudeSessionId - Claude session ID
+   * @param contentSessionId - Claude session ID
    * @param promptNumber - Prompt number within session
    * @param operationType - Type of operation being validated ('observation' or 'summarize')
    * @returns User prompt text if public, null if private
    */
   static checkUserPromptPrivacy(
     store: SessionStore,
-    claudeSessionId: string,
+    contentSessionId: string,
     promptNumber: number,
     operationType: 'observation' | 'summarize',
     sessionDbId: number,
     additionalContext?: Record<string, any>
   ): string | null {
-    const userPrompt = store.getUserPrompt(claudeSessionId, promptNumber);
+    const userPrompt = store.getUserPrompt(contentSessionId, promptNumber);
 
     if (!userPrompt || userPrompt.trim() === '') {
       logger.debug('HOOK', `Skipping ${operationType} - user prompt was entirely private`, {