* fix: narrow "not found" pattern in to_ai_friendly_error to avoid catching
non-element errors
Change `contains("not found")` to `contains("element not found")` so that
connection/state errors like "Browser not found" pass through unchanged
instead of being incorrectly mapped to "Element not found" message.
* remove comment
* fmt
* test: use real project error message in non-element not found test
