Add capability to force summarize all sessions (ignoring 30-day limit)

Current SessionService limits automatic summarization to sessions active in the last 30 days for performance. We need a manual override to summarize ALL sessions, including ancient ones (e.g. > 30 days old) that might have been missed or need a refresh.

Tasks:

1. Update openapi.yaml:

   • Add includeAll (boolean, default false) parameter to the summarize_sessions tool definition.
   • Update description to clarify the default 30-day behavior vs. the full scan.

2. Update SessionService.mjs:

   • Update summarizeSessions method signature to accept includeAll.
   • Update findSessionsToSummarize to accept includeAll.
   • Logic Change: If includeAll is true, remove the where: { timestamp: { $gt: ... } } clause from both Memory and Summary queries.
   • Pagination: Ensure pagination loop handles the potentially much larger dataset correctly (already implemented, but verify).

3. Update Documentation:

   • Update JSDoc for summarizeSessions and findSessionsToSummarize to document the new parameter and behavior.