Improve source parsing from Envato and Artgrid HTML

TODO.md

@@ -64,6 +64,30 @@
   - keep the anti-timeout optimization
   - recover Envato/Artgrid recall when the early pass is too narrow
 
+## Current Session Update (2026-03-13, HTML Snapshot Analysis)
+- Used saved HTML snapshots supplied by the user for:
+  - Envato item page
+  - Artgrid clip page
+- Findings:
+  - Envato page exposes clean `VideoObject` JSON-LD with:
+    - exact asset title
+    - rich description
+    - thumbnail URL
+    - preview mp4 URL
+  - Artgrid page exposes reliable meta fields for:
+    - title
+    - description
+    - thumbnail
+    - canonical URL
+  - Artgrid snapshot still does **not** expose a stable preview mp4 or m3u8 in the saved HTML or downloaded asset bundle inspected here
+- Fixes applied from the snapshots:
+  - Envato enrichment now prefers `VideoObject` JSON-LD over generic meta tags
+  - Envato search cards should now align much better with the actual source asset and preview
+  - Artgrid title/description are now cleaned so Gemini/source text is less polluted by site suffixes and generic boilerplate
+- Remaining limitation:
+  - Artgrid hover-video preview cannot be derived reliably from the provided snapshot alone
+  - if Artgrid preview video is still required, the next useful artifact is a browser HAR or DevTools network capture from an opened clip page
+
 ## Local Self-Test Workflow
 - Primary command:
   - `bash scripts/selftest.sh`