Add all new CI/CD workflow files for the staged branch promotion pipeline
(develop alpha beta main). Push triggers are intentionally disabled
workflows use workflow_dispatch or workflow_call only.
No changes to existing ci.yml. All workflows are inert until activated in
a follow-up PR.
New workflows:
- feature-pr.yml: auto-create PRs to develop (disabled)
- hotfix-pr.yml: emergency hotfix PRs to main (disabled)
- promote-branch.yml: staged promotion (disabled)
- release-orchestrator.yml: release pipeline (disabled)
- deployment-strategy.yml: npm + Docker deploy (workflow_call)
- testing-strategy.yml: progressive test gates (workflow_call)
- generate-changelog.yml: changelog generation (workflow_call)
- version-operations.yml: version bumping (workflow_call)
- release.yml: manual release trigger (workflow_dispatch)
- rollback.yml: emergency rollback (workflow_dispatch)
- discord-notify action: reusable notification
Also adds pipeline docs and updates CONTRIBUTING.md with future branch
strategy (clearly marked as not yet active).
Split from #10755 for safe, additive merge.
b4aefa3937
