feat(m6): one-click install + apply controls on Environment page — 0.10.0

Make the environment report actionable, not just advisory.

Install (reuses M9 installer):
- Add GameMode, MangoHud, cpupower to the component catalog (so they also show
  on the Setup page); catalog.by_id() lookup.
- "tool not installed" findings (GameMode/MangoHud) get an Install button.

Apply runtime-reversible tunables (D22, realizing the D9 consent-gated milestone):
- core/fixes.py: dropdown of live options + Apply for CPU governor, NVIDIA
  persistence, PCIe ASPM policy, vm.swappiness, THP. One pkexec command each,
  no reboot, reverts on reboot; chosen value validated against live options;
  writes go to sysfs/procfs/nvidia-smi, never GRUB. GRUB/mitigations stay
  suggestion-only.
- Finding gained optional action (install) + fix (apply) ids; shared
  finding_card renders the matching control; Environment page wires both and
  re-checks after a change.

Tests for fixes (parse, command builders, value validation, gameenv wiring).
Docs: D22 added (amends D9); SPEC/MODULES/ROADMAP updated. 0.9.0 -> 0.10.0.

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

tests/test_gameenv.py

@@ -30,7 +30,7 @@ class GovernorTests(unittest.TestCase):
     def test_powersave_is_warning(self):
         f = gameenv.evaluate_governor({"powersave"})
         self.assertEqual(f.severity, "warning")
-        self.assertIn("cpupower", f.suggestion)
+        self.assertEqual(f.fix, "cpu_governor")  # offers the live Apply dropdown
 
     def test_dynamic_is_info(self):
         self.assertEqual(gameenv.evaluate_governor({"schedutil"}).severity, "info")
@@ -43,7 +43,7 @@ class SwappinessTests(unittest.TestCase):
     def test_high_is_info_with_suggestion(self):
         f = gameenv.evaluate_swappiness(60)
         self.assertEqual(f.severity, "info")
-        self.assertIn("swappiness", f.suggestion)
+        self.assertEqual(f.fix, "swappiness")  # offers the live Apply dropdown
 
     def test_low_is_ok(self):
         self.assertEqual(gameenv.evaluate_swappiness(10).severity, "ok")