Break cli/contributing/changelog/archive/__main__.py into four
single-responsibility modules under the same package:
* versioning.py — pad_version / unpad_version / archive_filename
(the canonical <padded-semver>-<date>.md filename schema).
* archive_dir.py — existing_archives, archived_releases_from_directory,
build_index_section (filesystem operations on docs/changelog/).
* changelog_md.py — split_into_entries, md_body_after_header,
trim_and_archive (CHANGELOG.md parsing and trimming, plus the
always-rebuild-index logic).
* package_mirror.py — mirror_to_debian_changelog,
mirror_to_rpm_spec_changelog (Debian and RPM regeneration from
CHANGELOG.md kept entries, with the trailing notice that points at
docs.infinito.nexus and lists archived versions as plain text).
__main__.py shrinks to argparse plus a thin orchestration layer that
parses CHANGELOG.md once, runs trim_and_archive, reads the populated
archive directory, and mirrors into the package files.
Add `mirror_to_debian_changelog` and `mirror_to_rpm_spec_changelog`
content-idempotency: skip the write when the regenerated content
already matches what is on disk so re-runs leave file mtimes
unchanged. Verified end-to-end: a follow-up run on a fully-processed
tree leaves all three files (CHANGELOG.md, Debian changelog, RPM
spec) byte-identical and mtime-stable.
Replace `datetime.strptime` calls with `date.fromisoformat` so the
DTZ007 lint stays clean: we only need calendar-date parsing for
display formatting, not timezone-aware moments.
Tests follow the same split: one test_<module>.py per source module,
40 tests in total. Shared fixtures live in _helpers.py (underscore
prefix exempts it from the test-file-naming lint), and each test
class explicitly mixes TempRepoMixin with unittest.TestCase so the
test-files-have-tests AST lint sees the direct unittest base.
Update docs/contributing/actions/release.md so the procedure
description matches the current behaviour: package changelogs are
"mirrored" (not "trimmed") from CHANGELOG.md, and the idempotence
section calls out byte-idempotency on each of the three files.
Run the CLI once against the live tree to bring packaging/debian/
changelog and packaging/fedora/infinito-nexus.spec back into sync
with CHANGELOG.md and the docs/changelog/ archive directory.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>