feat(journal): search-first heuristic for existing work in calibration prompt

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/fabledassistant/services/journal_pipeline.py

@@ -79,6 +79,15 @@ MOMENT ENTITY LINKING — be conservative.
     are NOT places — drop them and let the user name the real one if it
     matters.
 
+EXISTING WORK — search before recording.
+  - If the user describes ongoing or completed work that references a specific
+    project or task by name or partial name (e.g. "the sebring task",
+    "continuing on the AT&T circuit", "finished the auth refactor"), CALL
+    search_notes FIRST to locate the existing task. Update its status or log
+    work on it instead of recording a new moment when an obvious match exists.
+  - Only call record_moment for that beat if no matching task surfaces and the
+    user confirms they want a moment recorded.
+
 WHEN LINKING ENTITIES: use the *_names parameters (person_names,
 place_names, task_titles, note_titles). Server resolves them to IDs by
 lookup. Do NOT pass *_ids unless you have an exact ID returned from