feat(cli): npx claude-mem adopt [--dry-run] [--branch X]

Adds a manual escape hatch for the worktree adoption engine. Covers
squash-merges where git branch --merged HEAD returns nothing, and
lets users re-run adoption on demand.

Wired through worker-service.cjs (same pattern as generate/clean)
so the command runs under Bun with bun:sqlite, keeping npx-cli/
pure Node. --cwd flag passes the user's working directory through
the spawn so the engine resolves the correct parent repo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/npx-cli/index.ts

@@ -52,6 +52,7 @@ ${pc.bold('Runtime Commands')} (requires Bun, delegates to installed plugin):
   ${pc.cyan('npx claude-mem restart')}              Restart worker service
   ${pc.cyan('npx claude-mem status')}               Show worker status
   ${pc.cyan('npx claude-mem search <query>')}       Search observations
+  ${pc.cyan('npx claude-mem adopt [--dry-run]')}    Stamp merged worktrees into parent project
   ${pc.cyan('npx claude-mem transcript watch')}     Start transcript watcher
 
 ${pc.bold('IDE Identifiers')}:
@@ -145,6 +146,13 @@ async function main(): Promise<void> {
       break;
     }
 
+    // -- Adopt merged worktrees -------------------------------------------
+    case 'adopt': {
+      const { runAdoptCommand } = await import('./commands/runtime.js');
+      runAdoptCommand(args.slice(1));
+      break;
+    }
+
     // -- Transcript --------------------------------------------------------
     case 'transcript': {
       const subCommand = args[1]?.toLowerCase();