Implements comprehensive unit test coverage for CoeditingRegistry.syncContext,
which derives context keys (cowriting.isCoediting, cowriting.baselineMode) via
vscode.commands.executeCommand — previously untested. Added 8 new tests:
- isCoediting: true for active editor with coediting doc
- isCoediting: false for undefined editor or non-entered doc
- baselineMode: uses hook result when set; defaults to "" otherwise
- exit idempotency: double exit fires onDidChange only once
All assertions inspect the mocked executeCommand call arguments directly.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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