Restore Envato and Artgrid fallback search breadth

TODO.md

@@ -50,6 +50,20 @@
 - Improved result rendering:
   - search cards now show source snippet/description separately from AI reason to reduce confusion between asset metadata and Gemini commentary
 
+## Current Session Update (2026-03-13, Regression Fix)
+- A regression was found after search optimization:
+  - Envato and Artgrid disappeared entirely for some real searches while Google Video still returned results
+- Root cause:
+  - the first optimization reduced query-variant breadth too aggressively
+  - the first 3 query variants were not enough to recover Envato/Artgrid in some real SearXNG result sets
+- Fix applied:
+  - search now runs in two stages
+  - stage 1 searches only the first few variants for speed
+  - stage 2 searches additional variants only for sources that still returned zero results
+- Intent:
+  - keep the anti-timeout optimization
+  - recover Envato/Artgrid recall when the early pass is too narrow
+
 ## Local Self-Test Workflow
 - Primary command:
   - `bash scripts/selftest.sh`