Add tests for the quick-open overlay's keymap-intent handlers (nav,
accept, dismiss), the no-match / truncated / walk-failure hints, the
search panel's error + no-results states and toggle re-run, the
controller's failed-grep and exclude paths, and engine glob/regex-group
cases. Restores the coverage floor (95.20%).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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