feat: automatic error feedback loop with bug report tracker (#80)

Errors and uncaught exceptions are now automatically captured, deduplicated,
persisted to a rotating log file, and filed as bug report tasks in the
existing task queue — giving Timmy a sovereign, local issue tracker with
zero new dependencies.

- Add RotatingFileHandler writing errors to logs/errors.log (5MB rotate, 5 backups)
- Add error capture module with stack-trace hashing and 5-min dedup window
- Add FastAPI exception middleware + global exception handler
- Instrument all background loops (briefing, thinking, task processor) with capture_error()
- Extend task queue with bug_report task type and auto-approve rule
- Fix auto-approve type matching (was ignoring task_type field entirely)
- Add /bugs dashboard page and /api/bugs JSON endpoints
- Add ERROR_CAPTURED and BUG_REPORT_CREATED event types for real-time feed
- Add BUGS nav link to desktop and mobile navigation
- Add 16 tests covering error capture, deduplication, and bug report routes

Co-authored-by: Alexander Payne <apayne@MM.local>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/dashboard/templates/base.html

@@ -37,6 +37,7 @@
       <a href="/marketplace/ui" class="mc-test-link">MARKET</a>
       <a href="/tools" class="mc-test-link">TOOLS</a>
       <a href="/swarm/events" class="mc-test-link">EVENTS</a>
+      <a href="/bugs" class="mc-test-link" style="color:#ff6b6b;">BUGS</a>
       <a href="/lightning/ledger" class="mc-test-link">LEDGER</a>
       <a href="/memory" class="mc-test-link">MEMORY</a>
       <a href="/router/status" class="mc-test-link">ROUTER</a>
@@ -73,6 +74,7 @@
     <a href="/marketplace/ui" class="mc-mobile-link">MARKET</a>
     <a href="/tools" class="mc-mobile-link">TOOLS</a>
     <a href="/swarm/events" class="mc-mobile-link">EVENTS</a>
+    <a href="/bugs" class="mc-mobile-link">BUGS</a>
     <a href="/lightning/ledger" class="mc-mobile-link">LEDGER</a>
     <a href="/memory" class="mc-mobile-link">MEMORY</a>
     <a href="/work-orders/queue" class="mc-mobile-link">WORK ORDERS</a>