feat: replace mirror.py + versions.py with repo-release-tools v1.10.1 rrt sync

[Anselmoo]

Context

Issue #171 identified that mirror.py missed the TOML-style rev = "v..." pattern in README.md due to hardcoded regexes.

PR #172 proposed replacing mirror.py with repo-release-tools v1.10.0, using:

• versions.py — a thin PEP 723 script for PyPI polling
• rrt bump … --no-commit in a CI shell loop for file updates + commits

This proposal

repo-release-tools v1.10.1 (released 2026-06-26) ships rrt sync, which makes versions.py and the shell loop entirely obsolete.

rrt sync --bump --commit --tag does everything in one call:

Responsibility	Before (mirror.py)	After (rrt sync)
PyPI polling	mirror.py — hardcoded urllib3 script	built-in, stdlib HTTP, zero extra deps
File update patterns	hardcoded regexes in Python	config-driven version_targets + pin_targets
Version iteration	hardcoded loop in Python	built-in, ascending
Git commit	hardcoded git commit in script	--commit (template: Mirror: {version})
Git tag	hardcoded git tag in script	--tag (annotated, prefix v)
CI step	uv run --no-project mirror.py	rrt sync --bump --commit --tag

Proposed changes

pyproject.toml

Add an [tool.rrt.upstream] sub-table and bump the dev dependency:

[dependency-groups]
dev = [
    "repo-release-tools>=1.10.1",
]

[tool.rrt]
release_branch = "main"
lock_command = []

[tool.rrt.upstream]
package = "ruff"
provider = "pypi"
commit_message = "Mirror: {version}"

[[tool.rrt.version_targets]]
path = "pyproject.toml"
kind = "pattern"
pattern = 'ruff==(\d+\.\d+\.\d+)'

[[tool.rrt.pin_targets]]
path = "README.md"
pattern = '(rev: v)(\d+\.\d+\.\d+)()'

[[tool.rrt.pin_targets]]
path = "README.md"
pattern = '(rev = "v)(\d+\.\d+\.\d+)(")'

[[tool.rrt.pin_targets]]
path = "README.md"
pattern = '(/ruff/)(\d+\.\d+\.\d+)(\.svg)'

.github/workflows/main.yml

Replace the 11-line shell loop with a single call:

# before
- name: Mirror new ruff versions
  run: |
    uv run --no-project mirror.py

# after
- name: Mirror new ruff versions
  run: uvx "repo-release-tools==$RRT_VERSION" sync --bump --commit --tag
  env:
    RRT_VERSION: "1.10.1"

Delete mirror.py and versions.py

No longer needed — rrt sync handles PyPI polling, file updates, commits, and tagging internally.

Dry-run output

✓ [DRY RUN] Mirror upstream ruff (pypi)
→ Current: 0.15.18

── Plan ──────────────────────────────────────────────────────
⊙ [dry-run] Would bump → 0.15.19 (files: pyproject.toml, README.md)
⊙ [dry-run] Would commit: "Mirror: 0.15.19"
⊙ [dry-run] Would tag: v0.15.19
⊙ [dry-run] Would bump → 0.15.20 (files: pyproject.toml, README.md)
⊙ [dry-run] Would commit: "Mirror: 0.15.20"
⊙ [dry-run] Would tag: v0.15.20

⊙ [dry-run] complete – no changes made

All four patterns (pyproject.toml dep, YAML rev, TOML rev, badge URL) are updated correctly — including the TOML rev = "v..." pattern that caused #171.

Ref: #171, #172