chore(changelog): include unreleased and full commit output

CONTRIBUTING.md

@@ -46,7 +46,7 @@ Rules:
 ## Changelog Process
 
 - Keep commit messages conventional.
-- Generate/update `CHANGELOG.md` with:
+- Generate/update `CHANGELOG.md` with release-focused sections (includes `Unreleased`):
 
 ```bash
 bun run changelog:release
@@ -57,3 +57,10 @@ bun run changelog:release
 ```bash
 bun run changelog:preview
 ```
+
+- For exhaustive output across all allowed commit types (`feat`, `fix`, `docs`, `test`, `ci`, `chore`, `refactor`, etc.):
+
+```bash
+bun run changelog:full:preview
+bun run changelog:full:release
+```