fix(container): scope orphan reaper by install label so peers don't kill each other

Two installs on the same host could trash each other's containers: the
reaper used `docker ps --filter name=nanoclaw-`, a substring match that
picked up every install's containers. A crash-looping peer (e.g. a legacy
v1 plist respawning ~6k times) would call cleanupOrphans on every boot and
kill the healthy install's session containers within seconds of spawn.

- Stamp `--label nanoclaw-install=<slug>` onto every spawned container.
- cleanupOrphans filters by that label; healthy peers are left alone.
- Setup preflight enumerates `com.nanoclaw*` launchd plists / nanoclaw
  user systemd units, probes state/runs, and unloads any that are
  crash-looping (state != running AND runs > 10) before installing
  this install's service.

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

src/container-runtime.ts

@@ -5,6 +5,7 @@
 import { execSync } from 'child_process';
 import os from 'os';
 
+import { CONTAINER_INSTALL_LABEL } from './config.js';
 import { log } from './log.js';
 
 /** The container runtime binary name. */
@@ -56,13 +57,22 @@ export function ensureContainerRuntimeRunning(): void {
   }
 }
 
-/** Kill orphaned NanoClaw containers from previous runs. */
+/**
+ * Kill orphaned NanoClaw containers from THIS install's previous runs.
+ *
+ * Scoped by label `nanoclaw-install=<slug>` so a crash-looping peer install
+ * cannot reap our containers, and we cannot reap theirs. The label is
+ * stamped onto every container at spawn time — see container-runner.ts.
+ */
 export function cleanupOrphans(): void {
   try {
-    const output = execSync(`${CONTAINER_RUNTIME_BIN} ps --filter name=nanoclaw- --format '{{.Names}}'`, {
-      stdio: ['pipe', 'pipe', 'pipe'],
-      encoding: 'utf-8',
-    });
+    const output = execSync(
+      `${CONTAINER_RUNTIME_BIN} ps --filter label=${CONTAINER_INSTALL_LABEL} --format '{{.Names}}'`,
+      {
+        stdio: ['pipe', 'pipe', 'pipe'],
+        encoding: 'utf-8',
+      },
+    );
     const orphans = output.trim().split('\n').filter(Boolean);
     for (const name of orphans) {
       try {