chore: bump version to 0.30.2

- Update version in version.go, default.nix, hook templates
- Add CHANGELOG.md entry for v0.30.2
- Add v0.30.1 and v0.30.2 to versionChanges in info.go
- Remove stale internal/deletions import from integration test
  (fixes CI failure from bd-fom refactor)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/templates/hooks/pre-commit

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.30.1
+# bd-hooks-version: 0.30.2
 #
 # bd (beads) pre-commit hook
 #