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Sprint 42 (reviewed): fixed HiveMind-specific example in smoke test step, added review notes clarifying asToolResponse usage and test file pattern. Sprint 43: Cross-File Context Assembly — WorkspaceFileIndex, ContextSliceAssembler, TokenBudgetEnforcer, whetstone_assemble_context MCP tool (Steps 674-678). Sprint 44: Taskitem Self-Containment Validator — PrerequisiteOpResolver, SelfContainmentScorer, TaskitemQualityAuditor, whetstone_validate_taskitem MCP tool (Steps 679-683). Directly addresses whether taskitem token reduction is real. Sprint 45: Agent Session Metrics + A/B Harness — AgentSessionRecorder, TaskCompletionMetrics, ABTestComparison, whetstone_start_recording + whetstone_get_metrics MCP tools (Steps 684-688). Produces the measured comparison between Whetstone-assisted and baseline agent runs. All sprints are generic editor tooling — no coupling to external systems. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>