chore(release): HealthChat 1.1.2

Remove the Linux desktop build from the release pipeline. It could never
succeed in this fork: the upstream Linux reusable pulls a build-env Docker
image keyed by the building commit's SHA from the upstream element-hq
registry, where the fork's SHA does not exist, so every tagged build failed
with `manifest unknown`. Desktop releases now ship macOS and Windows only.

- Drop the linux job + its release artifacts from build-healthchat-desktop.yaml
- Bump apps/desktop/package.json to 1.1.2
- Update releasing-healthchat skill + desktop README docs

.github/workflows/build-healthchat-desktop.yaml

@@ -1,13 +1,13 @@
 name: Build HealthChat Desktop
 
-# Builds the HealthChat desktop (Electron) app for Linux, macOS and Windows: the fork's
+# Builds the HealthChat desktop (Electron) app for macOS and Windows: the fork's
 # element-web webapp with the HealthChat plugin (healthchat-module.js + healthchat-elements.js)
 # injected, packaged via the element-desktop build pipeline and published to the GitHub Release.
 #
 # This is the desktop counterpart of build-healthchat.yaml (web). On a `healthchat-v*` tag it
 # runs alongside the web build; it first builds the element-plugin from healthchat-workspace,
 # builds the fork webapp with the plugin injected, then feeds it into build_desktop_prepare.yaml
-# (via `webapp-artifact`) and the per-platform build_desktop_{linux,macos,windows}.yaml reusables.
+# (via `webapp-artifact`) and the per-platform build_desktop_{macos,windows}.yaml reusables.
 #
 # Notes:
 #   - The reusable build workflows are pointed at THIS fork (repository/ref inputs) so the Electron
@@ -18,7 +18,7 @@ name: Build HealthChat Desktop
 #     GitHub environments (secrets/vars) to be configured. Without them the builds still run but
 #     produce unsigned/untrusted output. See apps/desktop/element.io/healthchat/README.
 #   - The desktop app version comes from apps/desktop/package.json (electron-builder); the per-job
-#     `version` input only feeds the macOS/Linux update manifest and is mangled into a nightly
+#     `version` input only feeds the macOS update manifest and is mangled into a nightly
 #     string by Windows squirrel, so it cannot set the app version. To keep the installers / About
 #     dialog in sync with the tag, apps/desktop/package.json must be bumped to the release version
 #     in the release commit. The "Assert desktop app version matches release" step below enforces
@@ -176,22 +176,6 @@ jobs:
             nightly: false
             deploy: false
 
-    linux:
-        name: Linux ${{ matrix.arch }}
-        needs: prepare
-        permissions:
-            contents: read
-        strategy:
-            matrix:
-                arch: [amd64, arm64]
-        uses: ./.github/workflows/build_desktop_linux.yaml
-        with:
-            repository: ${{ github.repository }}
-            ref: ${{ github.sha }}
-            arch: ${{ matrix.arch }}
-            sqlcipher: static
-            test: false
-
     macos:
         name: macOS
         needs: prepare
@@ -234,7 +218,7 @@ jobs:
 
     release:
         name: Publish to GitHub Release
-        needs: [linux, macos, windows]
+        needs: [macos, windows]
         # Only publish on a real tag push; manual workflow_dispatch runs build but do not publish.
         if: startsWith(github.ref, 'refs/tags/')
         runs-on: ubuntu-latest
@@ -254,8 +238,6 @@ jobs:
                   find dist-artifacts -type f \( -iname '*.dmg' -o -iname '*-mac.zip' \) -exec cp -v {} release-files/ \;
                   # Windows: per-machine MSI + Squirrel "Setup" installer
                   find dist-artifacts -type f \( -iname '*.msi' -o -iname '* Setup*.exe' \) -exec cp -v {} release-files/ \;
-                  # Linux: portable tarball + Debian package
-                  find dist-artifacts -type f \( -iname '*.tar.gz' -o -iname '*.deb' \) -exec cp -v {} release-files/ \;
                   echo "--- release files ---"
                   ls -la release-files
                   test -n "$(ls -A release-files)" || { echo "::error::No installer files collected"; exit 1; }