ci: keep main forwarded to active dev branch

[MuncleUscles]

Description

This updates the repo to use main as the static/default branch while keeping the active development branch as the real integration target. PRs opened against main are retargeted to the active dev branch, and pushes to the active dev branch fast-forward main.

Details

• active dev branch: v0.40-dev
• adds support/ci/ACTIVE_DEV_BRANCH as the repo-local source of truth
• adds retarget-main-prs.yaml for PRs opened against main
• adds fast-forward-main.yaml to move main forward from v0.40-dev
• adds branch-policy validation so the intended model is visible in CI

Validation

• bash -n .github/scripts/validate-branch-policy.sh
• local branch-policy script run
• yq parse for branch-policy/retarget/fast-forward workflows
• actionlint for branch-policy/retarget/fast-forward workflows

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 88dbfc8a-8a17-4366-8a77-c3d2eff6d0f8

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/main-dev-branch-policy

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