P11-T4: Add Keyboard Shortcuts & Command Palette

[SoundBlaster]

Description

P11-T4: Add keyboard shortcuts and a ? help overlay to the dashboard. Pure JS keydown listener — no external library. Keys: 1–4 scroll to chart sections, a to audit log, r resets metrics (with confirmation), e exports JSON, ? toggles the shortcut help overlay. Shortcuts are suppressed when focus is in an input field.

Also fixes a workflow bug: ARCHIVE_TASK.md and ARCHIVE.md now use git mv instead of plain mv so INPROGRESS deletions are staged atomically with the archive commit (previously left unstaged deletions after every task).

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactoring
• CI/CD improvement

Quality Gates

Before submitting, ensure all quality gates pass:

make check

Or run individually:

• make test - All tests pass with ≥90% coverage
• make lint - No linting errors
• make format - Code is properly formatted
• make typecheck - Type checking passes
• make doccheck - Documentation is synced with DocC (if docs changed)

Results: pytest — 403 passed, 5 skipped | ruff check src/ — All checks passed | coverage — 96.2%

Documentation Sync

• Documentation changes are synced with DocC catalog (or N/A)

Testing

• Added/updated tests for new functionality
• All tests pass locally
• Manually tested the changes

Checklist

• Code follows the project's style guidelines
• Self-review completed
• Comments added for complex code
• Documentation updated (if needed)
• No new warnings generated
• PR title is descriptive