release: 0.4.1b7

## Bump
- [ ] Major
- [ ] Minor
- [x] Beta
- [ ] Patch
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## Changelog

### Changed
- Settings `records.stream_type` now stores CDF stream template names (`BasicArchive`, `BasicLiveData`, etc.) instead of `mutable`/`immutable`; legacy values still map when creating streams (#300)

### Fixed
- Release workflow uses `git tag --merged HEAD` for branch-scoped version lookup, adds manual retry dispatch, and fails when the computed version already has a GitHub release (#304)
