v0.6.4

v0.6.4: SDK 2.18.1 + status panel SDK integration + cadence cut

- @ace-sdk/core ^2.14.0 → ^2.18.1 (API stable; pulls in upstream
  retry/error-class/cache improvements)
- Replaced raw fetch for top patterns with client.getTopPatterns()
  from the SDK. Brings retry, X-ACE-Client header, org/project
  resolution, and subscription-error handling. The 0.6.3 path fix
  (/patterns/top) is preserved through the SDK.
- Poll interval 60s → 5 min, and only when the panel is visible
  (setInterval skips if panel.visible === false). Existing
  onDidChangeViewState already refreshes on reopen, so users see
  fresh data instantly without unnecessary background polling.

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