fix(agent): give launchd units a log sink (StandardOut/ErrorPath)

launchd has no default log destination (unlike systemd's journald), so a unit
that fails to start (bare node, missing env) was silent — which hid the EX_CONFIG
+ loadConfig failures during this deploy. Route both units' stdout+stderr to
<stateDir>/{base-app,agent}.log. 281 tests pass.

agent/src/service/install.ts

@@ -11,7 +11,7 @@
  *   - FIX M-host-2service: base-app env (BIND_HOST/ALLOWED_ORIGINS/PORT/…) is routed to the
  *     base-app unit ONLY; the agent unit (which supervises frpc) never carries it.
  */
-import { dirname } from 'node:path'
+import { dirname, join } from 'node:path'
 import type { AgentConfig } from '../config/agentConfig.js'
 import {
   agentLabel,
@@ -225,9 +225,15 @@ export async function installService(
 
   if (platform === 'launchd') {
     const baseAppPath = launchdPlistPath(deps.homedir(), baseAppLabel())
-    deps.writeFile(baseAppPath, buildLaunchdPlist(baseAppExec, baseAppEnvWithPath, baseAppLabel()))
+    deps.writeFile(
+      baseAppPath,
+      buildLaunchdPlist(baseAppExec, baseAppEnvWithPath, baseAppLabel(), join(cfg.stateDir, 'base-app.log')),
+    )
     const agentPath = launchdPlistPath(deps.homedir(), agentLabel())
-    deps.writeFile(agentPath, buildLaunchdPlist([nodePath, bin, 'run'], agentEnv, agentLabel()))
+    deps.writeFile(
+      agentPath,
+      buildLaunchdPlist([nodePath, bin, 'run'], agentEnv, agentLabel(), join(cfg.stateDir, 'agent.log')),
+    )
     for (const path of [baseAppPath, agentPath]) {
       const { cmd, args } = launchdLoadCommand(path)
       await deps.runCommand(cmd, args)