release 1.3.2: update from Gitea, Linux-only CLI, desktop app for Linux and Windows

The updater reads latest.json from Gitea, built by scripts/make-latest-json.py
against the Gitea API (no gh CLI). Release workflow builds the Linux CLI and
the Linux+Windows desktop app, signs the updater artifacts and attaches
everything to the release.

Needs the repo secrets TAURI_SIGNING_PRIVATE_KEY and
TAURI_SIGNING_PRIVATE_KEY_PASSWORD, which I could not set (secret-store writes
are reserved for the user) - set them from ~/.tauri/guara-updater.key and
.pass before pushing a tag.

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

Cargo.toml

@@ -3,7 +3,7 @@ resolver = "2"
 members = ["crates/guara-core", "crates/guara-cli"]
 
 [workspace.package]
-version = "1.3.1"
+version = "1.3.2"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/lucasrguerra/guara"