feat(m9): .deb package + CI build/publish — 0.35.0

packaging/make_deb.py builds rigdoctor_<ver>_all.deb (Architecture: all) via
dpkg-deb, no debhelper: Depends python3; Recommends python3-pyside6/pyte (GUI by
default, --no-install-recommends = CLI only). Installs the package, both
launchers, desktop entry + icon; postinst refreshes the desktop database.
release.yml builds it as a release asset and optionally pushes to the Gitea apt
registry (REGISTRY_TOKEN). Verified locally: valid .deb, packaged launcher runs
'rigdoctor --version'. Docs/README/ROADMAP/MODULES updated; M9 complete.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/MODULES.md

@@ -18,7 +18,7 @@ Status: ⬜ not started · 🟦 designing · 🟨 in progress · ✅ done
 | M6 | Gaming env checks | Diagnostics | none | all | P2 | 🟨 |
 | M10 | Desktop GUI | Desktop UI | **python3-pyside6** | all | P2 | ✅ |
 | M11 | Tray / menu-bar applet | Desktop UI | **python3-pyside6** (+ AppIndicator on GNOME) | all | P2 | ✅ |
-| M9 | Installer | (meta) | none | all | P1 | 🟨 |
+| M9 | Installer (+ `.deb`) | (meta) | none | all | P1 | ✅ |
 | M12 | Session sharing (shared terminal) | Sharing | none (relay) | all | P3 | ✅ |
 | M13 | Auto-update | (core) | none (stdlib; user-local file swap) | all | P3 | ✅ |
 | M14 | AI assistant (explain diagnostics) | (optional) | none (stdlib urllib; Ollama or Claude) | all | P3 | ✅ |