CONTRIBUTING: use the semver- label names from .autorc

[asmacdo]

CONTRIBUTING.rst lists PR labels as major, minor, patch, ..., but those labels do not exist in the repo: .autorc maps release types to semver-major, semver-minor, etc. Following the doc gives 'minor' not found from gh pr edit --add-label.

• Rename the documented labels to their semver- names (and the "unlabelled means patch" sentence), with a pointer to .autorc.
• Drop skip-release: it is neither a repo label nor in .autorc, and with onlyPublishWithReleaseLabel nothing releases without release anyway.

Verified against .autorc and gh label list -R con/duct.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.03%. Comparing base (7a25f42) to head (80ec9ca).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #455   +/-   ##
=======================================
  Coverage   92.03%   92.03%           
=======================================
  Files          15       15           
  Lines        1344     1344           
  Branches      182      182           
=======================================
  Hits         1237     1237           
  Misses         71       71           
  Partials       36       36           

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[Copilot]

Copilot review overview

🟢 Approval recommended

It is a documentation-only change whose every renamed label was verified to match the names defined in .autorc.

Review effort: Balanced
Findings: None

What changed in this PR

This PR corrects the PR-label documentation in CONTRIBUTING.rst. The repository uses auto (configured via .autorc) to classify changelog entries and drive releases, and .autorc defines the semver labels with a semver- prefix (e.g. semver-major, semver-patch). The prior documentation listed unprefixed names (major, minor, patch, …) that don't exist in the repo, so following the docs (e.g. gh pr edit --add-label minor) failed. The change aligns the docs with the actual label names and removes a stale entry.

Changes:

• Renamed the documented labels to their semver- equivalents and updated the "unlabelled means patch" sentence to semver-patch, with a pointer to .autorc.
• Removed the skip-release entry, which is neither a repo label nor defined in .autorc (and is redundant given onlyPublishWithReleaseLabel).
• Kept the special release label unchanged.

File	Description
CONTRIBUTING.rst	Updated the recognized PR-label list and default-label sentence to match the semver--prefixed names defined in .autorc, and dropped the nonexistent skip-release label.

Verification notes: I confirmed against .autorc that all eight documented labels (semver-major, semver-minor, semver-patch, semver-internal, semver-documentation, semver-tests, semver-dependencies, semver-performance) match the configured name values exactly. The release label is auto's built-in publish trigger, so keeping it is correct, and skip-release is correctly removed.

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