feat: detect a hard-crashed diagnostic + analyze the crash boot — 0.15.0

A focused capture that ends without a clean stop (no session-stop, no live
recorder) is treated as a likely hard freeze.

- core/diagnostic.py: pending_crash() detects the unterminated session;
  acknowledge_crash() dismisses it; analyze_crash() combines the captured window
  (final readings + GPU-lost) with a focused scan of the PREVIOUS (crashed) boot
  + SMART/driver/persistence/temps.
- health.check_previous_boot() scans `journalctl -k -b -1`; run_health_checks
  gained include_journal to avoid double-scanning for the crash path.
- GUI: Games page shows a warning banner on launch for an interrupted diagnostic
  with Analyze crash / Dismiss → results dialog.
- Tests for crash detection / clean-stop / acknowledge / in-progress.

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

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rigdoctor"
-version = "0.14.0"
+version = "0.15.0"
 description = "Modular hardware monitoring & crash diagnostics for Linux gamers."
 readme = "README.md"
 requires-python = ">=3.11"