ci: vendor validation scripts and remove remote action pins

[hyperpolymath]

Automated PR to fix CI after deleted actions.

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Summary by Gitar

• CI validation scripts:
  • Added vendored validate-a2ml.sh and validate-k9.sh validation scripts in .githooks/
• Workflow updates:
  • Replaced remote action pins with local script executions for A2ML and K9 validation in .github/workflows/dogfood-gate.yml

_{This will update automatically on new commits.}

[gitar-bot]

CI failed: Code formatting check failed in the CI build because Rust source files were not formatted according to `rustfmt` rules.

Overview

1 change-related tooling failure found across 1 analyzed log, where rustfmt checks failed due to unformatted Rust source files.

Failures

Rust Code Formatting Failure (confidence: high)

• Type: tooling
• Affected jobs: 90126158708
• Related to change: yes
• Root cause: The codebase contains Rust files with formatting differences that violate rustfmt rules.
• Suggested fix: Run cargo fmt locally to format all Rust files, then commit and push the updated formatting changes.

Summary

• Change-related failures: 1 code formatting failure (rustfmt check)
• Infrastructure/flaky failures: 0
• Recommended action: Run cargo fmt to format the Rust source files and push the changes to fix the CI build.

Code Review ✅ Approved

Vendors validation scripts into .githooks and updates the dogfood-gate workflow to execute them locally instead of using remote action pins. No issues found.

Auto-approved: No blocking issues found.
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[gitar-bot]

Gitar has auto-approved this PR (configure)