feat(m15): opt-in logging + per-diagnostic storage + Report bundles — 0.30.0

One `logging_enabled` toggle (default off) gates everything (D25):
- core/applog.py: rotating app.log (no-op unless enabled); setup() at GUI/CLI start.
- core/diagstore.py: each diagnostic stored in DATA_DIR/diagnostics/<id>/ (capture,
  result.json, report.txt, scoped gamelogs, ai/ records of exactly what was sent to
  the model + which model + the reply). make_report() zips a diagnostic (+ app.log)
  into DATA_DIR/reports/.
- diagnostic.finish()/analyze_crash() store when enabled; DiagnosticResult.dir.
- GUI: Settings → Logging toggle; "Report" button on the diagnostic dialog; AI
  interactions recorded into the diagnostic dir on "Explain with AI".
- CLI: `rigdoctor bundle` (report is taken by the M4 health report).
- Tests for store/record_ai/make_report + applog gating; docs (D25, M15, Phase 8).

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

docs/ROADMAP.md

@@ -97,6 +97,13 @@ Ubuntu + NVIDIA first; `.deb` distribution (see `DECISIONS.md`).
 - [ ] *Possible follow-ups:* interactive chat grounded in the data; more reference-KB entries;
       an "Explain" button on the System Health page.
 
+## Phase 8 — Logging & report bundles  (M15, D25)
+- [x] **Opt-in logging** (one `logging_enabled` toggle): rotating `app.log` (`core/applog.py`)
+      + **per-diagnostic storage** in its own directory (`core/diagstore.py`) — capture,
+      result, report, scoped game logs, and AI-interaction records.
+- [x] **Report** bundle — zip a diagnostic (incl. exactly what was sent to the AI, the model,
+      and its reply) into the reports folder. GUI button + `rigdoctor bundle`.
+
 > **Out of scope:** stress/repro module (D7); multi-distro support and packaging beyond
 > Ubuntu/apt + `.deb` (D15) — a thin seam is kept but not built out.