[bboe]

Brings this Slack message-deletion CLI up to the current toolchain (matching the recent extended_http_server / flask-image-uploader overhauls), unblocking CodeSorter (which requires Python ≥3.10).

Highlights

• Drop Python 2 — removed the handle_encoding shim and .travis.yml (with its 2.7 job); switched to f-strings, lazy %-logging, timezone-aware datetimes, and operator.itemgetter.
• Full type annotations, pyright strict clean. The dynamic slacker client surface is described with local Protocols and a single cast (slacker stays as the dependency — it still imports and works on 3.10–3.14; swapping to slack_sdk would be a separate, untestable rewrite).
• Package structure — implementation moved to deslackify.cli so __init__ only re-exports; RetryException → RetryError.
• Packaging — setup.py/setup.cfg/MANIFEST.in → hatchling + hatch-vcs pyproject.toml (tag-driven versioning), keeping the deslackify entry point.
• Tests — expanded (rate-limit retries, pagination, dry-run, error counting) and moved under tests/.
• CI/CD — GitHub Actions lint + 3.10–3.14 matrix, plus a tag-driven trusted-publishing workflow; pre-commit battery (codesorter, ruff ALL, docstrfmt, pyright, …).
• README install instructions now use uv.

Tests pass on 3.10 and 3.14 locally; pre-commit is clean.

Note: publish.yml uses PyPI trusted publishing — it needs a one-time setup on PyPI (add bboe/deslackify publish.yml as a trusted publisher) and a pypi GitHub environment before the next tagged release will publish.