[docs] Update documentation for features from 2026-07-30

[github-actions]

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Documentation Updates - 2026-07-30

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

• Documented the engine.auth.provider: gcp frontmatter fields in the full frontmatter reference (triggered by [instructions] Sync instruction files with release v0.84.0 #49104)

📝 Detailed Changes & References

Changes Made

• Updated docs/src/content/docs/reference/frontmatter-full.md to include gcp as a recognized engine.auth.provider value
• Added the missing workload-identity-provider, service-account, project, and location fields for Google Cloud Vertex AI Workload Identity Federation

Merged PRs Referenced

• [instructions] Sync instruction files with release v0.84.0 #49104 - [instructions] Sync instruction files with release v0.84.0

AI dictionary alignment summary

• Terms reviewed: engine, coding agent, safe outputs, frontmatter, workflow
• Terms adopted: frontmatter, engine
• Conflicts resolved: none

Skipped Issues

• None identified for this run.

Notes

Open documentation issue queries failed in this sandbox with gh issue list returning malformed version:. The update was based on confirmed documentation drift found while reviewing recent merged changes and existing reference pages.

Generated by 📝 Daily Documentation Updater · gpt54 · 18.9 AIC · ⊞ 9.2K · ◷

• expires on Jul 31, 2026, 3:22 AM UTC-08:00

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Warning

threat detection engine error
The threat detection engine encountered an error and could not complete analysis. This is a tooling failure, not a security finding.

Details

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Review the workflow run logs for details.

Generated by 👨‍🍳 PR Sous Chef · gpt54 · 21.4 AIC · ⊞ 6.3K · ◷
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[github-actions]

Threat detection produced a warning for this pull request output.

These changes need to be scrutinized before merge and only merged after a careful manual review.

• Detection reason: agent_failure
• Review workflow run logs: https://github.com/github/gh-aw/actions/runs/30537983827

[gh-aw-bot]

Warning

threat detection engine error
The threat detection engine encountered an error and could not complete analysis. This is a tooling failure, not a security finding.

Details

The threat detection engine failed to produce results.

Review the workflow run logs for details.

@copilot please run the pr-finisher skill, review this docs PR for any missed fixes, and rerun checks if you make updates.

Generated by 👨‍🍳 PR Sous Chef · gpt54 · 21.4 AIC · ⊞ 6.3K · ◷
_{Comment /souschef to run again}

[Copilot]

[!WARNING]
threat detection engine error
The threat detection engine encountered an error and could not complete analysis. This is a tooling failure, not a security finding....

Reviewed with the pr-finisher pass: no missed doc fixes found, so no new commit was needed beyond e45050a. I also checked the referenced workflow runs/logs; there were no failed jobs to fix.

[github-actions]

🎉 This pull request is included in a new release.

Release: v0.84.1