Release 0.0.5: health report (M4), installer (M9), update check (M13)

M4 — health report (the 0.0.4 CHANGELOG entry, folded into this release):
- core/health.py: scan journalctl (Xid/panic/OOM/MCE/AER/thermal), SMART,
  NVIDIA driver mismatch, journald persistence, live temps -> findings
- CLI `rigdoctor report` (text/JSON); GUI Health tab; scanner tests

M9 — installer (first cut):
- core/{catalog,sysenv,installer}.py; `rigdoctor install [--check] [-y]`
- GUI Setup tab: detect distro/GPU, show optional components, one-click
  install of missing apt packages via pkexec/sudo

M13 — update check (check half):
- core/updates.py; sidebar shows up-to-date / "Update to v…" / unavailable

Plus tests, version bump to 0.0.5, CHANGELOG, and doc status updates.

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

CHANGELOG.md

@@ -5,6 +5,27 @@ 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).
 
+## [0.0.5] - 2026-05-21
+### Added
+- **M9 installer (first cut)**: detects distro / package manager / GPU; a catalog of optional
+  components (smartmontools, lm-sensors, dmidecode, pciutils, libnotify) with what each
+  enables; `rigdoctor install [--check] [-y]` installs missing apt packages via pkexec/sudo
+  with consent; GUI **Setup** tab with one-click install. Fixes the "smartmontools missing"
+  gap in the health report.
+- **Update check (M13, check half)**: on GUI launch the sidebar checks the Gitea releases API
+  and shows "up-to-date", an "Update to v…" button if a newer release exists, or "update check
+  unavailable" if the API can't be reached anonymously.
+
+## [0.0.4] - 2026-05-21
+### Added
+- **M4 health report**: scans kernel logs (NVIDIA Xid incl. 79 "fell off the bus", kernel
+  panic, OOM, MCE, PCIe AER, thermal, amdgpu reset), SMART health, NVIDIA driver/library
+  mismatch, journald persistence, and live temps → prioritized plain-language findings with
+  suggested fixes (read-only, D9).
+- CLI `rigdoctor report` (text + `--json`).
+- GUI **Health** tab: runs checks in the background; findings shown as severity-colored cards.
+- Tests for the journal scanner.
+
 ## [0.0.3] - 2026-05-21
 ### Added
 - Show the app version (`v<version>`) in the GUI sidebar.