[WIP] Fix failing GitHub Actions workflow for integration

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Fix failing Integration: Workflow String & Sanitization test

Root Cause

The TestValidationMessageFormat and other integration tests were creating lock files without the required metadata header. Lock files now require either:

• New format: # gh-aw-metadata: {"schema_version":"v1"}
• Legacy format: # frontmatter-hash: <64-char-hash>

Minimal Changes

• Add metadata headers to lock files in TestValidationMessageFormat
• Add metadata headers to lock files in TestActionUsageVersionPopulation
• Add metadata headers to lock files in TestValidateActionSHAsInLockFile (both up-to-date and outdated scenarios)
• Add metadata headers to lock files in TestMissingActionCache
• Add metadata headers to lock files in TestExtractActionsFromRealLockFile
• Run the specific failing test to verify the fix - ✅ PASS
• Run integration tests matching CI pattern - ✅ PASS
• Run full test suite to ensure no regressions

Original prompt

Fix the failing GitHub Actions workflow Integration: Workflow String & Sanitization
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 63926118531
Job URL: https://github.com/github/gh-aw/actions/runs/22116568757/job/63926118531

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Pull request overview

This pull request fixes failing integration tests by adding the required gh-aw-metadata header to lock file test fixtures. Lock files now require either the new JSON metadata format (# gh-aw-metadata: {"schema_version":"v1"}) or the legacy frontmatter-hash format. The PR adds the minimal valid metadata header to all affected test cases in action_sha_checker_integration_test.go.

Changes:

• Added # gh-aw-metadata: {"schema_version":"v1"} header to 6 lock file test fixtures in integration tests
• Ensures lock file schema validation passes for all tests that use ExtractActionsFromLockFile or ValidateActionSHAsInLockFile

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