Agent self-healing: auto-migrate old config key names on startup

Instead of crash-looping with KeyError when config has old key names,
load_config() now detects and migrates automatically:
- server_url -> jarvis_url
- api_key -> registration_key
- adds hostname from gethostname() if missing
- adds ssl_verify (false if URL is a bare IP)
- falls back to /opt/jarvis-agent/config.json if /etc path missing

Migrated config is saved in place so the fix is permanent.
Agents self-update within 24h via the existing update_url mechanism.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent/jarvis-agent.py

@@ -28,11 +28,45 @@ AGENT_VERSION = "3.1"
 # ── Config helpers ────────────────────────────────────────────────────────────
 
 def load_config() -> dict:
+    legacy_path = "/opt/jarvis-agent/config.json"
+
     if not os.path.exists(CONFIG_PATH):
-        print(f"[ERROR] Config not found at {CONFIG_PATH}. Run the installer first.", flush=True)
-        sys.exit(1)
-    with open(CONFIG_PATH) as f:
-        return json.load(f)
+        if os.path.exists(legacy_path):
+            print(f"[JARVIS] Config found at legacy path {legacy_path} - migrating...", flush=True)
+            Path(CONFIG_PATH).parent.mkdir(parents=True, exist_ok=True)
+            with open(legacy_path) as f:
+                cfg = json.load(f)
+        else:
+            print(f"[ERROR] Config not found at {CONFIG_PATH}. Run the installer first.", flush=True)
+            sys.exit(1)
+    else:
+        with open(CONFIG_PATH) as f:
+            cfg = json.load(f)
+
+    # Migrate old key names so the agent self-heals instead of crash-looping
+    import re as _re
+    changed = False
+    if "server_url" in cfg and "jarvis_url" not in cfg:
+        cfg["jarvis_url"] = cfg.pop("server_url")
+        print("[JARVIS] Config migrated: server_url -> jarvis_url", flush=True)
+        changed = True
+    if "api_key" in cfg and "registration_key" not in cfg:
+        cfg["registration_key"] = cfg.pop("api_key")
+        print("[JARVIS] Config migrated: api_key -> registration_key", flush=True)
+        changed = True
+    if "hostname" not in cfg:
+        cfg["hostname"] = socket.gethostname()
+        changed = True
+    if "ssl_verify" not in cfg:
+        cfg["ssl_verify"] = not bool(_re.match(r"https?://\d+\.\d+\.\d+\.\d+", cfg.get("jarvis_url", "")))
+        changed = True
+
+    if changed:
+        with open(CONFIG_PATH, "w") as f:
+            json.dump(cfg, f, indent=2)
+        print("[JARVIS] Config saved after migration.", flush=True)
+
+    return cfg
 
 def load_state() -> dict:
     if os.path.exists(STATE_PATH):