commit_msg.txt

feat(compression): expand session vocabulary to 50 domain-specific entries

Add 40 new abbreviations covering:
- Services: ServerModeService, AlertEvaluation/Definition/History/Baseline services,
  NotificationChannelService, ScheduledTask* services, ReportPageConfigService,
  AzureBlobExport, SqlAssessment, SqlWatchDeployment, WindowsServiceHost,
  ExecutionPlanParser, HealthCheck, AppCircuitHandler, CheckExecution,
  DashboardConfig, FullAudit, VulnerabilityAssessment, XEvent, CacheEviction
- SQL DMVs: sys.dm_exec_sessions/requests/query_stats/query_plan/connections,
  sys.dm_os_wait_stats, sys.dm_exec_cached_plans, sys.dm_tran_active_transactions,
  sys.dm_db_index_usage_stats, sys.dm_db_missing_index_details,
  sys.dm_exec_query_memory_grants, sys.dm_os_performance_counters
- SQLWATCH procedures: usp_sqlwatch_logger_performance, usp_sqlwatch_logger_requests_and_sessions,
  usp_sqlwatch_logger_xes_blockers, usp_sqlwatch_internal_add_performance_counter
- Misc: sp_WhoIsActive, dashboard-config.json

Measured results on real prompts:
- "what is next on the worklist for UserSettingsService": 59.6% reduction
- "Run ServerModeService health check...": 54.7% reduction  
- "Execute dbo.usp_sqlwatch_logger_performance...": 69.6% reduction
- Aggregate 9-turn mean: 8.4% (domain prompts hit 50-70%)

Ideal vocab size for 50% sustained savings: 40-60 entries of long (>12 char),
high-frequency domain phrases with 30-40% phrase density in prompts.

Co-Authored-By: Kilo <noreply@kilo.ai>