ci: remove broken Claude Code Review workflow from master

This workflow was failing on every PR (action exited non-zero after
the bun-install step) and generating noise in the Actions tab.

Already removed on `develop` via PR #121 commit 10de094 -- this is the
direct cleanup on master so the workflow stops triggering until the
next develop -> master merge.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

Author: JoeMatt