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fix: address umputun review — FallbackRenderer for hg --only, methods convention

- --only in hg repos now uses FallbackRenderer (delegates to Hg renderer
  first, falls back to disk read), matching the git path behaviour
- FallbackRenderer.inner changed from *Git to renderer interface so both
  Git and Hg can be wrapped
- parseStatus and hgStatusToFileStatus converted to methods on *Hg per
  CLAUDE.md convention
- Reverted TestDetectVCS_Git to integration test per reviewer preference