feat(dashboard): add decision board for strategy selection

Why:
- Compare is the wrong surface for two-stage family selection over the 10-doc set.

Changes:
- Add the Decision Tab; raise GET /experiments default/max so the board can load the grid client-side.

Impact:
- Operators pick fixed_size ±N vs semantic@Boundary from existing Experiments.

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

src/storage/sqlite.py

@@ -408,9 +408,11 @@ def get_experiment(experiment_id: str) -> dict[str, Any] | None:
 
 
 def list_experiments(
-    *, document_id: str | None = None, offset: int = 0, limit: int = 50
+    *, document_id: str | None = None, offset: int = 0, limit: int = 200
 ) -> dict[str, Any]:
     """List experiments, optionally filtered by document."""
+    limit = max(1, min(int(limit), 500))
+    offset = max(0, int(offset))
     conn = _connect()
     try:
         if document_id: