feat: Pi agent server on port 4747 for Hermes recruitment

- HTTP API for inter-agent task delegation
- Endpoints: /status, /agent/manifest, /agent/task, /agent/signal
- Actions: read_file, write_file, bash, git_push, schema_verify
- Security: only accepts 127.0.0.0/8, 192.168.0.0/24, 100.64.0.0/10
- Background process PID saved to .pi/agent-server.pid
- Agent card at .pi/pi-agent.json for discovery

.pi/pi-agent.json

@@ -0,0 +1,37 @@
+{
+  "id": "pi",
+  "name": "Pi Coding Agent",
+  "version": "0.74.2",
+  "status": "online",
+  "host": {
+    "name": "mac-mini-1",
+    "os": "macOS",
+    "local_ip": "192.168.0.10",
+    "tailscale_ip": "100.72.2.115",
+    "ssh_port": 22,
+    "agent_port": 4747
+  },
+  "endpoints": {
+    "status": "http://100.72.2.115:4747/status",
+    "manifest": "http://100.72.2.115:4747/agent/manifest",
+    "task": "http://100.72.2.115:4747/agent/task",
+    "signal_read": "http://100.72.2.115:4747/agent/signal/{name}",
+    "signal_write": "http://100.72.2.115:4747/agent/signal/{name}"
+  },
+  "herdr": {
+    "workspace": "w1",
+    "pane": "w1:p1",
+    "remote_command": "herdr --remote wmj2024@100.72.2.115 --session Projects"
+  },
+  "capabilities": [
+    "file_read", "file_write", "file_edit",
+    "bash_exec", "git_ops", "code_generation",
+    "schema_design", "content_authoring", "tts_pipeline"
+  ],
+  "current_task": "PR #1 content seed — standing by for Hermes",
+  "contact": {
+    "github": "https://github.com/maifors/falah-mobile/pull/1",
+    "gitea": "http://13.140.161.244:3080/wmj/falah-mobile/issues/1"
+  },
+  "timestamp": "2026-06-28T05:25:00Z"
+}