fix(embed): fast-fail + auto-restart Ollama on solved-search hang

Embeddings timeout was 120s, causing multi-minute hangs when Ollama was
down during F4/F6/F7 solved-search. Now: connect_timeout=5s across all
HTTP clients (REST + Ollama), read_timeout reduced to 30s for embeddings,
and OllamaEmbeddings auto-restarts the server on ConnectionError before
degrading gracefully.

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

harness/tht/rest/client.py

@@ -28,7 +28,7 @@ class RestClient:
                 url,
                 json=args,
                 headers={"X-API-Key": self.cfg.api_key},
-                timeout=self.cfg.timeout,
+                timeout=(self.cfg.connect_timeout, self.cfg.timeout),
                 verify=verify,
             )
         except requests.RequestException as e: