Every document filename now mirrors its lifecycle state with a status
suffix (e.g., .draft.md, .wip.md, .accepted.md). No more bare .md for
tracked document types. Also renamed all from_str methods to parse to
avoid FromStr trait confusion, introduced StagingDeploymentParams struct,
and fixed all 19 clippy warnings across the codebase.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
