Misfiled fragment from feature/ branch created a subdirectory under
changelog.d/ which towncrier doesn't support. Move the fragment to the
correct flat location and add a changelog-check mise task + prek hook
to prevent this from happening again.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
## Summary
- Replace pre-commit with [prek](https://github.com/j178/prek), a faster Rust-native drop-in alternative
- Migrate config from `.pre-commit-config.yaml` (YAML) to `prek.toml` (TOML)
- Add new built-in checks: case conflicts, private key detection, executable shebangs
- Install prek via mise native registry (`aqua:j178/prek`) instead of pipx
- Update all doc references across README, contributing guide, and how-to docs
## Notes
- `check-yaml` still uses the remote `pre-commit-hooks` repo because prek's builtin fast path doesn't support `--unsafe` yet (needed for Ansible custom YAML tags)
- All existing custom hooks (docs validation, container version check, mikado invariant, workflow validation) work unchanged
- Tested: all hooks pass on clean tree, deliberate doc link breakage is caught
## Test plan
- [x] `prek run --all-files` passes all checks
- [x] Broken wiki-link correctly caught by `docs-check-links`
- [x] taplo-format auto-fixes TOML formatting on commit
- [x] commit-msg hook (mikado invariant) fires correctly
Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/276
