ci: remove obsolete label sync workflow

[devantler]

🤖 Generated by the Daily AI Assistant

Why

The scheduled Sync Labels workflow is obsolete and now fails on main because it fetches the retired devantler-tech/actions label file path. Label ownership has moved to the organization-level declarative label manifests, so keeping this workflow creates recurring noise instead of maintaining labels.

What

• Remove .github/workflows/.sync-labels.yaml.
• Update AGENTS.md so reusable-workflows maintenance no longer references the removed internal label-sync workflow.

Validation

• git diff --check
• yamllint .github/workflows/
• Ruby stdlib YAML parse over .github/workflows/*.yaml

Notes

actionlint .github/workflows/*.yaml was attempted, but it is blocked by pre-existing unrelated code-quality permission-scope findings in ci.yaml, run-dotnet-tests.yaml, and validate-go-project.yaml.

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed the scheduled GitHub Actions label-synchronization workflow and updated AGENTS.md to clarify that dot-prefixed maintenance workflows are excluded from the reusable workflow_call inventory.

Possibly related issues

• devantler-tech/reusable-workflows#350: Directly tracks removal of the failing nightly Sync Labels workflow.

Possibly related PRs

• devantler-tech/reusable-workflows#342: Also modifies the .sync-labels.yaml workflow and its pinned label-sync action.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately summarizes the main change: removing the obsolete label sync workflow.
Description check	✅ Passed	The description clearly matches the changeset by explaining the workflow removal and the AGENTS.md update.

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[devantler]

🤖 Generated by the Daily AI Assistant

@coderabbitai review

The PR description has been filled in with the workflow-removal rationale, scope, validation evidence, and the existing actionlint caveat so the pre-merge Description check can re-evaluate current PR metadata.

[coderabbitai]

@devantler Thanks for updating the PR description with the removal rationale, scope, validation evidence, and the actionlint caveat. I'll review the current state of the PR now.

✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

[devantler]

@coderabbitai review

🤖 Generated by the Daily AI Assistant

The PR body currently contains the workflow-removal rationale, scope, validation evidence, and actionlint caveat, but the latest CodeRabbit pre-merge summary visible through GitHub is still the older missing-description result from before that body update. Please refresh the pre-merge checks against the current PR metadata.

[coderabbitai]

@devantler Understood — I'll re-run the review now so the pre-merge checks pick up the current PR description and metadata.

✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

[botantler-1]

🎉 This PR is included in version 5.6.7 🎉

The release is available on GitHub release

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