refactor: implement in-process worker architecture for hooks (#722)

* fix: stop generating empty CLAUDE.md files

- Return empty string instead of "No recent activity" when no observations exist
- Skip writing CLAUDE.md files when formatted content is empty
- Remove redundant "auto-generated by claude-mem" HTML comment
- Clean up 98 existing empty CLAUDE.md files across the codebase
- Update tests to expect empty string for empty input

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

* build assets

* refactor: implement in-process worker architecture for hooks

Replaces spawn-based worker startup with in-process architecture:
- Hook processes now become the worker when port 37777 is free
- Eliminates Windows spawn issues (NO SPAWN rule)
- SessionStart chains: smart-install && stop && context

Key changes:
- worker-service.ts: hook case starts WorkerService in-process
- hook-command.ts: skipExit option prevents process.exit() when hosting worker
- hooks.json: single chained command replaces separate start/hook commands
- worker-utils.ts: ensureWorkerRunning() returns boolean, doesn't block
- handlers: graceful fallback when worker unavailable

All 761 tests pass. Manual verification confirms hook stays alive as worker.

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

* context

* a

* MAESTRO: Mark PR #722 test verification task complete

All 797 tests passed (3 skipped, 0 failed) after merge conflict resolution.

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

* MAESTRO: Mark PR #722 build verification task complete

* MAESTRO: Mark PR #722 code review task complete

Code review verified:
- worker-service.ts hook case starts WorkerService in-process
- hook-command.ts has skipExit option
- hooks.json uses single chained command
- worker-utils.ts ensureWorkerRunning() returns boolean

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

* MAESTRO: Mark PR #722 conflict resolution push task complete

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

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

src/utils/claude-md-utils.ts

@@ -145,8 +145,6 @@ export function formatTimelineForClaudeMd(timelineText: string): string {
   const lines: string[] = [];
   lines.push('# Recent Activity');
   lines.push('');
-  lines.push('<!-- This section is auto-generated by claude-mem. Edit content outside the tags. -->');
-  lines.push('');
 
   // Parse the API response to extract observation rows
   const apiLines = timelineText.split('\n');
@@ -212,8 +210,7 @@ export function formatTimelineForClaudeMd(timelineText: string): string {
   }
 
   if (observations.length === 0) {
-    lines.push('*No recent activity*');
-    return lines.join('\n');
+    return '';
   }
 
   // Group by date