feat(m6): PowerMizer + Wine/Steam versions + non-Steam launchers — 0.22.0

M6 leftovers (the watcher defers to M9's trigger-mode work):
- gameenv: check_gpu_powermizer (NVIDIA, X; degrades when the gpu target won't
  resolve), check_wine (wine --version), check_steam_client (dpkg package version);
  steam.client_version() helper.
- core/launchers.py: detect Lutris (read-only SQLite pga.db) and Heroic (Epic
  legendary + GOG JSON) installed games; Game gained a `launcher` field.
- Games page + `rigdoctor games` list non-Steam games alongside Steam, tagged by
  launcher; Run Diagnostic works on them (auto-launch stays Steam-only).
- Tests for launchers (synthetic Lutris db + Heroic json).

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

docs/ROADMAP.md

@@ -34,7 +34,9 @@ Ubuntu + NVIDIA first; `.deb` distribution (see `DECISIONS.md`).
       This is also the D12 "pick a game" foundation. *Env-check engine done* (`rigdoctor gameenv`
       + GUI Environment page): PCIe ASPM, NVIDIA persistence, CPU governor, GameMode, MangoHud,
       swappiness, shader cache, THP, mitigations, Proton versions — read-only with fix commands.
-      *Pending:* non-Steam launchers (Lutris/Heroic) + GPU power-profile (PowerMizer) checks.
+      Also: GPU PowerMizer (X), Wine + Steam-client versions, and non-Steam launchers
+      (Lutris/Heroic, `core/launchers.py`). *Pending:* the zero-config watcher (D12 fallback,
+      lands with M9's trigger-mode work).
 - [ ] SMART integration (smartmontools if present)
 
 ## Phase 4 — Desktop UI & installer