feat: Stamp CHANGELOG.md with version during CI tag

[kodroi]

Summary

• Adds a new step in the CI tag job that replaces ## Unreleased in CHANGELOG.md with ## vX.Y.Z (YYYY-MM-DD) using the GitVersion output and current date
• Includes CHANGELOG.md in the version bump commit's git add
• Gracefully skips if no ## Unreleased section exists (exits 0)
• CHANGELOG.md is not in the versionable path filter, so this change does not trigger additional version bumps

Test plan

• Verify CI passes on this PR
• Merge and confirm that the next version tag commit includes the stamped CHANGELOG.md

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Automated changelog versioning in the CI/CD pipeline to streamline release processes.
  • Updated build configuration to support enhanced release management automation.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Configuration files updated to extend the blocking list and automate changelog versioning in the CI pipeline. The .block file now includes an additional package.json entry, while the CI workflow adds a new step that replaces "Unreleased" section headers with version-tagged entries during tag operations.

Changes

Cohort / File(s)	Summary
Blocking Configuration .block	Added "opencode/package.json" to the blocked list, extending the existing blocking rules beyond the Claude plugin configuration.
CI Workflow Automation .github/workflows/ci.yml	Introduced "Update CHANGELOG version" step in tag workflow that replaces "## Unreleased" with versioned headers using GitVersion outputs and current date. Updated commit step to include CHANGELOG.md alongside existing files.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Add CHANGELOG.md #25: Introduces CHANGELOG.md file that the new CI step operates on during version tagging.
• feat: Add OpenCode plugin support #24: Adds opencode/package.json which is now referenced in the blocking list via .block.

Poem

🐰 A rabbit hops through config files with glee,
Blocking what mustn't be, wild and free,
The changelog dances from "Unreleased" to versioned release,
With GitVersion's magic touch, automation brings peace! ✨📝

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/changelog-version-stamp

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