[tool] Exempt AGENTS.md from version and changelog checks

[reidbaker-agent]

This came up as part of #12668 which needed the labels. This pr excludes AGENTS.md from both pub publishing and from needing changelog/version requirements.

• @reidbaker

Agent authored description

Exempts AGENTS.md from requiring CHANGELOG updates and version bumps in package validation, adds AGENTS.md as a package support file in repo tooling, and adds AGENTS.md to .pubignore in camera_android_camerax.

Summary

• Repository Tooling:
  • script/tool/lib/src/common/package_state_utils.dart: Added pathComponents.last == 'AGENTS.md' to _isDevChange so developer/agent guidelines in AGENTS.md do not trigger missing CHANGELOG or version bump errors.
  • script/tool/lib/src/common/file_filters.dart: Added path.endsWith('/AGENTS.md') to isPackageSupportFile.
  • script/tool/CHANGELOG.md: Added changelog entry under ## NEXT.
• Package .pubignore:
  • packages/camera/camera_android_camerax/.pubignore: Added AGENTS.md to prevent publishing agent guidelines to pub.dev.
• Tests:
  • Added unit tests in script/tool/test/common/package_state_utils_test.dart, script/tool/test/common/file_filters_test.dart, and script/tool/test/validate_command_version_test.dart.

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed features or bug fixes.
• All existing and new tests are passing.
• I updated/added relevant documentation.
• The title of the PR starts with the name of the package and conforms to the style guide.

[gemini-code-assist]

Code Review

This pull request exempts AGENTS.md from requiring version and changelog changes by updating file filters and package state utilities to recognize it as a package support and dev-facing file. It also adds corresponding unit tests and updates .pubignore for the camera_android_camerax package. There are no review comments, and I have no feedback to provide.

[reidbaker]

Convert to draft until tests pass.

[gemini-code-assist]

Code Review

This pull request exempts AGENTS.md files from requiring version and changelog changes. It updates the tooling to recognize AGENTS.md as a package support file and a dev-facing change, and adds corresponding unit tests to verify this behavior. There are no review comments to address.

[reidbaker]

Ironically the labels are needed on this pr because pubignore is not an excluded file. I think that is correct because if the ignore changes caused added files for a release then you probably do want a new version.