Update Claude Code keybinding actions

[jeet-dekivadia]

Summary

• add the documented Scroll and Doctor Claude Code keybinding contexts
• accept newer documented actions and built-ins emitted by the generated default keybindings file
• add fixtures covering the new contexts and action identifiers

Fixes #5709.

Documentation: https://code.claude.com/docs/en/keybindings

Validation

• git diff --check
• jq empty src/schemas/json/claude-code-keybindings.json src/test/claude-code-keybindings/all-contexts.json src/test/claude-code-keybindings/current-actions.json
• verified context and action enums contain no duplicates
• verified fixture action values are present in the schema enum

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @domdomegg, @bogini, @sarahdeaton, and @antrewmorrison - if they write a comment saying "LGTM" then it will be merged.

[domdomegg]

LGTM

[github-actions]

Merging because @domdomegg is a code-owner of all the changes - thanks!