PR_26171_GAMMA_008-sequential-queue-branch-governance-alignment

[ToolboxAid]

Summary

• Renames and extends MAIN BRANCH EXECUTION GUARD as EXECUTION BRANCH VALIDATION GUARD.
• Keeps main as the default required execution branch.
• Adds approved Sequential Codex Queue Mode branch governance using team/<TEAM>/<workstream>.
• Documents queue-mode start gate PASS/FAIL criteria, TEAM ownership enforcement, and owner-controlled EOD merge approval.

Validation

• git diff --check
• Targeted text checks for modified branch guard, default main, queue-only approved branches, TEAM ownership boundaries, and EOD approval enforcement.

Skipped by request:

• Playwright, because this is docs/static governance work only.
• Samples smoke, because this is docs/static governance work only.

Reports

• docs_build/dev/reports/codex_review.diff
• docs_build/dev/reports/codex_changed_files.txt
• docs_build/dev/reports/PR_26171_GAMMA_008-sequential-queue-branch-governance-alignment.md
• docs_build/dev/reports/PR_26171_GAMMA_008-sequential-queue-branch-governance-alignment-manual-validation-notes.md
• docs_build/dev/reports/PR_26171_GAMMA_008-sequential-queue-branch-governance-alignment-instruction-compliance-checklist.md

Merge Control

Draft PR only. Not merged. EOD merge remains owner-controlled and requires explicit approval.

[ToolboxAid]

Closed by Governance Phase 1 completion and historical consolidation.