chat: reap orphaned per-cwd opencode serves on startup

Each pooled per-cwd server is a ~0.5GB process; across officer restarts the previous
instance's servers would orphan and pile up. On module load, kill any opencode serve on
a non-fixed port (the fixed OPENCODE_SERVER_URL port is preserved).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/servers/api/chat/opencode/server-manager.ts

@@ -22,6 +22,30 @@ type OpenCodeServer = { baseUrl: string; proc: Subprocess };
 const servers = new Map<string, OpenCodeServer>();
 const starting = new Map<string, Promise<OpenCodeServer>>();
 
+// On startup, reap orphaned per-cwd serves left by a previous officer instance (each ~0.5GB) so they
+// don't accumulate across restarts. The fixed server (OPENCODE_SERVER_URL) is preserved by port.
+(function reapOrphanServers() {
+  const fixedPort = (() => {
+    try {
+      return new URL(OPENCODE_SERVER_URL).port || '4096';
+    } catch {
+      return '4096';
+    }
+  })();
+  try {
+    Bun.spawnSync([
+      'bash',
+      '-c',
+      `ss -tlnp 2>/dev/null | grep -F opencode | grep -oP '127\\.0\\.0\\.1:\\K[0-9]+' | sort -u | while read -r p; do ` +
+        `[ "$p" = "${fixedPort}" ] && continue; ` +
+        `pid=$(ss -tlnp 2>/dev/null | grep "127.0.0.1:$p " | grep -oP 'pid=\\K[0-9]+' | head -1); ` +
+        `[ -n "$pid" ] && kill "$pid" 2>/dev/null; done`,
+    ]);
+  } catch {
+    /* best effort */
+  }
+})();
+
 async function isHealthy(baseUrl: string): Promise<boolean> {
   try {
     const res = await fetch(`${baseUrl}/api/health`, { signal: AbortSignal.timeout(3000) });