The two edits promised in the review of #799:
- The main pane's Ctrl+V branch hands the keydown to the paste trap, and
nothing tested that call: with it reverted to `_handleImagePaste()` every
test still passed and Firefox would paste twice again. A source pin now
fails on that, like the Ctrl+C one in terminal-copy-clean.test.ts.
- architecture-invariants and src/web/CLAUDE.md described the key's own paste
as reaching the trap in every browser. Since #799 that is Chromium and
WebKit only: in Firefox the trap cancels the keydown.
Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>