feat: Task 10 — AMQP connection layer with aio-pika

amqp.py: connect/disconnect/get_channel/publish with auto-reconnect
  - Graceful degradation when aio-pika not installed
  - Lazy secret file reader via config.get_amqp_url()
  - Fire-and-forget publish (logs error, never raises)
  - Connection errors caught and logged (non-fatal)

config.py: AMQP_RECONNECT_DELAY, exchanges, get_amqp_url() helper

app.py: connect in lifespan after assess_hardware, disconnect on shutdown

requirements.txt: aio-pika>=9.0.0

tests/test_amqp.py: 3 mocked tests (publish success, publish disconnected
no-raise, get_channel reconnect)

135 tests pass (132 existing + 3 new)
Fixes: AGENTS.md test/run commands (venv was incomplete)

config.py

@@ -16,6 +16,23 @@ SEARXNG_BASE = "http://localhost:8888"
 DEFAULT_MODEL = "llama3.1:latest"
 COMPLETIONS_API_KEY = os.environ.get("JARVISCHAT_COMPLETIONS_API_KEY", "jc-sk-" + os.urandom(24).hex())
 
+# --- AMQP ---
+AMQP_RECONNECT_DELAY = 5
+AMQP_EXCHANGE_ADMIN = "jc.admin"
+AMQP_EXCHANGE_SYSTEM = "jc.system"
+AMQP_SECRET_PATH = "/home/gramps/.jc_amqp_secret"
+
+def get_amqp_url() -> str:
+    url = os.environ.get("JARVISCHAT_AMQP_URL")
+    if url:
+        return url
+    try:
+        with open(AMQP_SECRET_PATH) as f:
+            pw = f.read().strip()
+    except (FileNotFoundError, OSError):
+        pw = "password"
+    return f"amqp://jarvischat:{pw}@localhost:5672/jarvischat"
+
 # --- Auth ---
 SESSION_TIMEOUT_SECONDS = 90
 MAX_PIN_ATTEMPTS = 5