fix: rss classifier think-tag stripping, briefing calendar dict access, embed empty-string guard

- rss_classifier: strip <think>...</think> blocks (qwen3 reasoning output)
  before JSON parse; use strict=False for control chars; bump timeout 30s→120s
- briefing_pipeline: list_events returns dicts not Event objects — fix
  attribute access (.all_day/.start_dt/.title) to dict access
- embeddings: guard upsert_note_embedding and semantic_search_notes against
  empty-string input to prevent Ollama embed 400 errors

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

src/fabledassistant/services/briefing_pipeline.py

@@ -172,14 +172,18 @@ async def _gather_internal(user_id: int) -> dict:
             user_id=user_id, date_from=day_start, date_to=day_end
         )
         for e in internal_events:
-            if e.all_day:
+            if e.get("all_day"):
                 time_str = "all day"
-            elif e.start_dt:
+            elif e.get("start_dt"):
-                local_dt = e.start_dt.astimezone(user_tz) if e.start_dt.tzinfo else e.start_dt.replace(tzinfo=timezone.utc).astimezone(user_tz)
+                from datetime import datetime as _dt
+                start = e["start_dt"]
+                if isinstance(start, str):
+                    start = _dt.fromisoformat(start)
+                local_dt = start.astimezone(user_tz) if start.tzinfo else start.replace(tzinfo=timezone.utc).astimezone(user_tz)
                 time_str = local_dt.strftime("%-I:%M %p")
             else:
                 time_str = "unknown time"
-            calendar_events.append(f"{e.title} at {time_str}")
+            calendar_events.append(f"{e.get('title', 'Event')} at {time_str}")
     except Exception:
         logger.warning("Failed to gather internal calendar events for briefing", exc_info=True)
     # Also pull CalDAV events (deduped)

src/fabledassistant/services/embeddings.py

@@ -63,6 +63,8 @@ def _cosine_similarity(a: list[float], b: list[float]) -> float:
 
 async def upsert_note_embedding(note_id: int, user_id: int, text: str) -> None:
     """Generate and persist an embedding for a note. Safe to fire-and-forget."""
+    if not text or not text.strip():
+        return
     try:
         embedding = await get_embedding(text)
     except Exception:
@@ -97,6 +99,8 @@ async def semantic_search_notes(
     *threshold* are returned, sorted highest-first.
     Returns an empty list if the embedding model is unavailable or on any error.
     """
+    if not query or not query.strip():
+        return []
     try:
         query_vec = await get_embedding(query)
     except Exception:

src/fabledassistant/services/rss_classifier.py

@@ -7,6 +7,7 @@ Called from rss.py after new items are stored — fire-and-forget.
 
 import json
 import logging
+import re
 from datetime import datetime, timezone
 
 import httpx
@@ -37,7 +38,7 @@ async def _llm_classify(prompt: str, model: str) -> str:
         "stream": False,
         "options": {"num_ctx": 2048, "temperature": 0.0},
     }
-    async with httpx.AsyncClient(timeout=30.0) as client:
+    async with httpx.AsyncClient(timeout=120.0) as client:
         resp = await client.post(f"{Config.OLLAMA_URL}/api/chat", json=payload)
         resp.raise_for_status()
         return resp.json().get("message", {}).get("content", "")
@@ -75,13 +76,17 @@ async def classify_items_batch(
 
     try:
         raw = await _llm_classify(prompt, model)
+        # Strip <think>...</think> blocks emitted by reasoning models (e.g. qwen3)
+        raw = re.sub(r"<think>.*?</think>", "", raw, flags=re.DOTALL)
         # Extract JSON from response (LLM may wrap it in markdown)
         raw = raw.strip()
         if raw.startswith("```"):
             raw = raw.split("```")[1]
             if raw.startswith("json"):
                 raw = raw[4:]
-        parsed = json.loads(raw)
+        raw = raw.strip()
+        # Allow control characters that may appear in LLM-generated JSON strings
+        parsed = json.loads(raw, strict=False)
         return {int(k): v for k, v in parsed.items() if isinstance(v, list)}
     except Exception:
         logger.warning("RSS classification failed", exc_info=True)