chore: add release templates and expand third-party manifest

.github/ISSUE_TEMPLATE/release_checklist.md

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+---
+name: Release checklist
+about: Track stable release readiness
+title: "release: vX.Y.Z"
+labels: ["release"]
+assignees: []
+---
+
+## Pre-release validation
+
+- [ ] Node import/startup passes on clean ComfyUI
+- [ ] Core workflows smoke-tested
+- [ ] `third_party/forks_manifest.yaml` reviewed/updated
+- [ ] `CHANGELOG.md` updated
+- [ ] Release notes drafted (`docs/RELEASE_NOTES_TEMPLATE.md`)
+
+## Publish
+
+- [ ] Create annotated tag (`vX.Y.Z`)
+- [ ] Push tag
+- [ ] Publish GitHub release with notes
+
+## Post-release
+
+- [ ] Announce stable version to users
+- [ ] Track regressions/bug reports

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+Describe what this PR changes and why.
+
+## Type of change
+
+- [ ] Docs
+- [ ] Refactor
+- [ ] Feature
+- [ ] Fix
+- [ ] Breaking change
+
+## Checklist
+
+- [ ] I updated docs (if needed)
+- [ ] I updated `CHANGELOG.md` (if needed)
+- [ ] I tested node loading in ComfyUI
+- [ ] I documented third-party derivations/changes in `third_party/`
+- [ ] I verified no secrets/tokens are included
+
+## Testing Notes
+
+- ComfyUI version tested:
+- Platform tested:
+- Result:
+
+## Screenshots / Workflow evidence (optional)
+
+Attach screenshots or a workflow JSON reference if helpful.