Prepare GitHub alpha launch (README, CI, tests, release workflow)

.github/pull_request_template.md

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+## Summary
+
+Describe what changed and why.
+
+## Type of Change
+
+- [ ] Feature
+- [ ] Fix
+- [ ] Refactor
+- [ ] Docs
+- [ ] CI / Build
+
+## What Was Tested
+
+- [ ] `cargo fmt --check`
+- [ ] `cargo clippy --all-targets --all-features -- -D warnings`
+- [ ] `cargo test`
+- [ ] `cargo check`
+- [ ] Manual smoke test (`build` / `list` / `remove`) when behavior changed
+
+## Behavior / Risk Notes
+
+List any edge cases, compatibility impacts, or known limitations.
+
+## Screenshots (if relevant)
+
+Only needed when desktop integration behavior/UI-visible changes are involved.