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/shared/worker-utils.ts

@@ -4,7 +4,6 @@ import { readFileSync } from "fs";
 import { logger } from "../utils/logger.js";
 import { HOOK_TIMEOUTS, getTimeout } from "./hook-constants.js";
 import { SettingsDefaultsManager } from "./SettingsDefaultsManager.js";
-import { getWorkerRestartInstructions } from "../utils/error-messages.js";
 
 const MARKETPLACE_ROOT = path.join(homedir(), '.claude', 'plugins', 'marketplaces', 'thedotmack');
 
@@ -112,30 +111,25 @@ async function checkWorkerVersion(): Promise<void> {
 
 /**
  * Ensure worker service is running
- * Polls until worker is ready (assumes worker-service.cjs start was called by hooks.json)
+ * Quick health check - returns false if worker not healthy (doesn't block)
+ * Port might be in use by another process, or worker might not be started yet
  */
-export async function ensureWorkerRunning(): Promise<void> {
-  const maxRetries = 75;  // 15 seconds total
-  const pollInterval = 200;
-
-  for (let i = 0; i < maxRetries; i++) {
-    try {
-      if (await isWorkerHealthy()) {
-        await checkWorkerVersion();  // logs warning on mismatch, doesn't restart
-        return;
-      }
-    } catch (e) {
-      logger.debug('SYSTEM', 'Worker health check failed, will retry', {
-        attempt: i + 1,
-        maxRetries,
-        error: e instanceof Error ? e.message : String(e)
-      });
+export async function ensureWorkerRunning(): Promise<boolean> {
+  // Quick health check (single attempt, no polling)
+  try {
+    if (await isWorkerHealthy()) {
+      await checkWorkerVersion();  // logs warning on mismatch, doesn't restart
+      return true;  // Worker healthy
     }
-    await new Promise(r => setTimeout(r, pollInterval));
+  } catch (e) {
+    // Not healthy - log for debugging
+    logger.debug('SYSTEM', 'Worker health check failed', {
+      error: e instanceof Error ? e.message : String(e)
+    });
   }
 
-  throw new Error(getWorkerRestartInstructions({
-    port: getWorkerPort(),
-    customPrefix: 'Worker did not become ready within 15 seconds.'
-  }));
+  // Port might be in use by something else, or worker not started
+  // Return false but don't throw - let caller decide how to handle
+  logger.warn('SYSTEM', 'Worker not healthy, hook will proceed gracefully');
+  return false;
 }