chore(releaser): release v1.7.1 — Apache 2.0 license, Hugo build fix

- Add Apache License 2.0 (Copyright 2026 K3nnyfr <alex@k3nny.fr>), linked from a new README License section
- Fix task docs:build leaving stale files in docs/public by passing --cleanDestinationDir to hugo
- Ignore /.task/ (Task runner's local checksum cache)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 <img src="docs/static/images/releaser-logo-128.png" alt="releaser logo" width="128">
 
-![release](https://img.shields.io/badge/release-v1.7.0-blue.svg)
+![release](https://img.shields.io/badge/release-v1.7.1-blue.svg)
 
 A CI-friendly release automation tool for GitFlow workflows using Conventional Commits.
 
@@ -169,3 +169,7 @@ release:
     reports:
       dotenv: release.env          # exposes NEXT_VERSION to downstream jobs
 ```
+
+## License
+
+Apache License 2.0 — see [LICENSE](LICENSE).