fix(runtime): improve local service reliability

Close SQLite handles safely on Windows, clean orphaned vectors, normalize Ollama endpoints, and surface model errors without leaking reasoning tags.

Co-authored-by: Cursor <cursoragent@cursor.com>

synapse/nexus_config.py

@@ -104,6 +104,36 @@ def path(name: str) -> Path:
         raise KeyError(f"Unknown config path name: {name}")
 
 # --- Settings class and exported instance ---
+def _normalize_ollama_host(raw: str) -> str:
+    """Turn an OLLAMA_HOST value into a URL a client can actually connect to.
+
+    OLLAMA_HOST is Ollama's *server bind* variable, and the common way to expose
+    Ollama on a LAN is `OLLAMA_HOST=0.0.0.0:11434`. Taken literally as a client
+    base URL that is unusable twice over: 0.0.0.0 means "every local interface"
+    to a listener but is not a destination, and there is no scheme for httpx to
+    parse. The result was a silent empty model list, because list_models()
+    catches everything and returns [].
+
+    So: supply the scheme when it's missing, and rewrite wildcard binds to
+    loopback. An explicit host is left alone — someone pointing at a real remote
+    Ollama means it.
+    """
+    host = (raw or "").strip().rstrip("/")
+    if not host:
+        return "http://127.0.0.1:11434"
+    if "://" not in host:
+        host = f"http://{host}"
+    scheme, _, rest = host.partition("://")
+    hostport = rest.split("/", 1)[0]
+    name, sep, port = hostport.rpartition(":")
+    if not sep:            # no port given
+        name, port = hostport, ""
+    # 0.0.0.0 and :: are bind-any; from a client they mean "this machine".
+    if name.strip("[]") in ("0.0.0.0", "::", ""):
+        name = "127.0.0.1"
+    return f"{scheme}://{name}:{port}" if port else f"{scheme}://{name}"
+
+
 class Settings:
     """
     Lightweight settings container. Use `settings` instance for runtime access,
@@ -126,8 +156,15 @@ class Settings:
         self.ollama_log: Path = OLLAMA_LOG
         self.chat_log: Path = CHAT_LOG
 
-        # Env overrides
-        self.ollama_host: str = os.getenv("OLLAMA_HOST", "http://127.0.0.1:11434")
+        # Env overrides. Two values from one variable, because OLLAMA_HOST means
+        # two different things: where a server should LISTEN, and where a client
+        # should CONNECT. `ollama_bind` keeps the user's literal intent for a
+        # serve we spawn (0.0.0.0 to expose it on the LAN); `ollama_host` is the
+        # connectable form for our own requests.
+        self.ollama_bind: str = os.getenv("OLLAMA_HOST", "") or "127.0.0.1:11434"
+        self.ollama_host: str = _normalize_ollama_host(
+            os.getenv("OLLAMA_HOST", "http://127.0.0.1:11434")
+        )
         self.ollama_timeout: int = int(os.getenv("OLLAMA_TIMEOUT", "120"))
 
     def as_dict(self) -> Dict[str, Any]: