Initialize League GUI prototype

docs/release-checklist.md

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+# Release Checklist
+
+No release process exists yet. Complete this checklist only after the project has real build, test, audit, and artifact commands.
+
+## Version
+
+- [ ] Version number updated.
+- [ ] Changelog updated.
+- [ ] README updated.
+
+## Quality
+
+- [ ] Working tree is clean.
+- [ ] Lint or type checks pass.
+- [ ] Tests pass or missing tests are documented.
+- [ ] Build succeeds in CI.
+
+## Security
+
+- [ ] Security review is current.
+- [ ] Dependency audit is clean or documented.
+- [ ] No secrets are committed.
+- [ ] Release artifacts do not contain local config files.
+
+## Artifacts
+
+- [ ] Artifacts are produced by documented commands.
+- [ ] Artifacts are uploaded.
+- [ ] Download links work.
+- [ ] Package registry links work if used.
+- [ ] Installer, portable, or archive naming is clear.
+
+## Release
+
+- [ ] Git tag created.
+- [ ] Release notes written.
+- [ ] Release published.
+- [ ] Post-release download smoke test completed.