chore: update CONTRIBUTING.md with revised release process steps

[ttypic]

update CONTRIBUTING.md with revised release process steps

Summary by CodeRabbit

• Documentation
  • Updated contribution guidelines with a new release workflow. The release process now uses GitHub releases with approval-based publishing to PyPI, replacing the previous automated build-and-publish sequence. Changelog update procedures have been reorganized accordingly.

[coderabbitai[bot]]

Walkthrough

The CONTRIBUTING.md release process was rewritten to remove direct build/publish steps and introduce a GitHub release → tag → approval workflow for PyPI publishing; the changelog update was retained and moved to after release notes with a simplified generator example.

Changes

Cohort / File(s)	Summary
Contribution guide CONTRIBUTING.md	Removed synchronous build/publish/tag steps (poetry build/publish, automatic tagging). Added guidance to create a GitHub release with a tag and use a Release Workflow that requires explicit approval before publishing to PyPI. Repositioned changelog update to occur after release notes and simplified the changelog-generator example (references v1.0.0).

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub
    participant ReleaseWF as Release Workflow
    participant PyPI as PyPI
    participant Changelog as Changelog

    Dev->>GH: Create tag & GitHub Release
    GH->>ReleaseWF: Trigger release workflow (await approval)
    Note over ReleaseWF: Approval required before publish
    ReleaseWF-->>PyPI: Publish package (post-approval)
    PyPI-->>ReleaseWF: Confirm publish
    Dev->>Changelog: Update changelog with release notes
    Changelog-->>Dev: Changelog updated

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Single documentation file changed.
• Verify clarity of new release-approval steps and that the changelog example matches repository conventions.
• Check no remaining references to the removed automated build/publish commands.

Poem

🐰 The tag I plant, the release I sing,

Approvals drum before bells ring.
Changelog hops in after the show,
Then PyPI welcomes what we sow. 🥕

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating CONTRIBUTING.md with revised release process steps, which aligns with the provided summary.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch update-contributing-guide

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