release 1.0.1: update from Gitea, Linux-only CLI, desktop app for Linux and Windows

The updater reads the latest release from Gitea. update::apply refuses to
overwrite anything but the CLI. Release workflow builds the Linux CLI;
scripts/build-gui.sh builds the Linux and Windows desktop app. Docs say Linux
and Windows only.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CONTRIBUTING.md

@@ -17,9 +17,9 @@ cargo test --workspace
 node scripts/check-ui-i18n.mjs            # UI translation coverage
 ```
 
-CI runs on Linux, Windows and macOS; run these before pushing — almost everything that fails CI shows up here in seconds. Documentation-only changes (`*.md`, `docs/`) are light on CI.
+CI runs on Linux only (Gitea has one runner); run these before pushing — almost everything that fails CI shows up here in seconds. Documentation-only changes (`*.md`, `docs/`) are light on CI.
 
-Live capture exists only on Linux (`AF_PACKET` + netlink); on Windows and macOS those paths compile but aren't exercised. Parsing and cracking tests run on all three, because they're offline.
+Live capture exists only on Linux (`AF_PACKET` + netlink); the code behind Windows and macOS paths still compiles and is covered by `cargo check`, but neither runs in CI nor is built for release.
 
 ## Where to work