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>

CHANGELOG.md

@@ -5,6 +5,19 @@ All notable changes to RigDoctor are recorded here. Format follows
 (`MAJOR.MINOR.PATCH`, pre-1.0). `__version__` and `pyproject.toml` must match the git
 release tag (so the auto-updater, D18, can compare versions).
 
+## [0.22.0] - 2026-05-22
+### Added
+- **M6 breadth.** Environment checks now also report **GPU PowerMizer** mode (NVIDIA, X — flags
+  Adaptive/Auto and suggests Prefer-Max-Performance), the **Wine** version, and the **Steam
+  client** version.
+- **Non-Steam launchers.** Lutris (its SQLite library) and Heroic (Epic + GOG JSON stores) are
+  detected (`core/launchers.py`) and listed on the Games page and `rigdoctor games`, tagged by
+  launcher. You can Run Diagnostic on them too (records while you play; auto-launch stays
+  Steam-only).
+### Notes
+- The zero-config game watcher (D12 fallback) is deferred to the M9 trigger-mode work, where the
+  service integration lives.
+
 ## [0.21.0] - 2026-05-22
 ### Added
 - **Live monitor TUI (M2).** `rigdoctor monitor` is now a proper **curses** dashboard: