[FanWu-ai]

Summary

Remove every matching key binding without skipping adjacent entries. KeyBindings.remove() currently removes from the same list it is iterating, leaving some matching bindings active. This affects both removal by handler and removal by key sequence, including aliases such as enter and c-m.

Iterate over a snapshot in both paths, preserving the original list object, remaining binding order, and existing cache invalidation.

Validation

• Clean upstream baseline: 156 tests passed before production changes; all required local lint, format, spelling, type and pre-commit checks passed.
• Eight regression cases fail against unchanged source; controls cover interleaved matches and a missing handler.
• Final full suite: 171 passed on Linux / Python 3.12.14.
• Coverage includes both lookup caches, merged registries, multiple keys sharing a handler, key aliases, and dispatch after removal.
• Ruff lint/format, typos, strict mypy for win32/linux/darwin, all 12 configured pre-commit hooks, sdist/wheel builds, and git diff --check passed.

This leaves the unrelated unknown-key error addressed by #2043 unchanged. Platform-specific mypy checks are static checks, not native OS test runs. Hosted CI status is separate from these local results.

Prepared and tested with OpenAI Codex assistance. No human review is claimed.