refactor(heartbeat): config-driven checks, channel delivery, remove hardcoded values

Heartbeat system overhaul:
- Fix email/calendar checks to parse JSON output correctly
- Add per-check cooldowns and quiet hours config
- Send findings to Discord channel instead of just logging
- Auto-reindex KB when stale files detected
- Claude CLI called only if HEARTBEAT.md has extra instructions
- All settings configurable via config.json heartbeat section

Move hardcoded values to config.json:
- allowed_tools list (claude_session.py)
- Ollama URL/model (memory_search.py now reads ollama.url from config)

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

src/memory_search.py

@@ -14,16 +14,53 @@ import httpx
 
 log = logging.getLogger(__name__)
 
-OLLAMA_URL = "http://10.0.20.161:11434/api/embeddings"
-OLLAMA_MODEL = "all-minilm"
-EMBEDDING_DIM = 384
-DB_PATH = Path(__file__).resolve().parent.parent / "memory" / "echo.sqlite"
-MEMORY_DIR = Path(__file__).resolve().parent.parent / "memory"
+PROJECT_ROOT = Path(__file__).resolve().parent.parent
+DB_PATH = PROJECT_ROOT / "memory" / "echo.sqlite"
+MEMORY_DIR = PROJECT_ROOT / "memory"
 
+# Defaults — overridable via config.json ollama/memory sections
+_OLLAMA_BASE_URL = "http://localhost:11434"
+_OLLAMA_MODEL = "all-minilm"
+_EMBEDDING_DIM = 384
 _CHUNK_TARGET = 500
 _CHUNK_MAX = 1000
 _CHUNK_MIN = 100
 
+# Runtime config (populated by init_config)
+OLLAMA_URL = f"{_OLLAMA_BASE_URL}/api/embeddings"
+OLLAMA_MODEL = _OLLAMA_MODEL
+EMBEDDING_DIM = _EMBEDDING_DIM
+
+
+def init_config(config=None) -> None:
+    """Load settings from config object. Call once at startup."""
+    global OLLAMA_URL, OLLAMA_MODEL, EMBEDDING_DIM
+    if config is None:
+        # Try loading from config.json directly
+        config_file = PROJECT_ROOT / "config.json"
+        if config_file.exists():
+            import json
+            try:
+                with open(config_file, encoding="utf-8") as f:
+                    data = json.load(f)
+                base_url = data.get("ollama", {}).get("url", _OLLAMA_BASE_URL)
+                OLLAMA_URL = f"{base_url.rstrip('/')}/api/embeddings"
+                OLLAMA_MODEL = data.get("ollama", {}).get("model", _OLLAMA_MODEL)
+                EMBEDDING_DIM = data.get("ollama", {}).get("embedding_dim", _EMBEDDING_DIM)
+            except (json.JSONDecodeError, OSError):
+                pass
+        return
+
+    # Config object with .get() method
+    base_url = config.get("ollama.url", _OLLAMA_BASE_URL)
+    OLLAMA_URL = f"{base_url.rstrip('/')}/api/embeddings"
+    OLLAMA_MODEL = config.get("ollama.model", _OLLAMA_MODEL)
+    EMBEDDING_DIM = config.get("ollama.embedding_dim", _EMBEDDING_DIM)
+
+
+# Auto-init from config.json on import
+init_config()
+
 
 def get_db() -> sqlite3.Connection:
     """Get SQLite connection, create table if needed."""