refactor(trail): tidy tune onboarding after review
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- Extract runnersDir(repoRoot) using paths.EntireDir; share it between loadTuneRunners and ensureRunnersPresent instead of duplicating the ".entire/runners" path literal.
- Drop the unused
createdbool from ensureRunnersPresent (caller ignored it); tests now assert filesystem state (defaults written / existing runner left untouched), a stronger check than the bool.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: b59e6739990a
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