Implement sprints 166-168 production code generation gates and loop

docs/sprint166_168_taskitem_execution_log_2026-02-26.md

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+# Sprint 166/167/168 Taskitem Execution Log (2026-02-26)
+
+## MCP taskitem runs
+
+- `logs/taskitem_runs/sprint166_plan_20260225_175406`
+- `logs/taskitem_runs/sprint167_plan_20260225_175406`
+- `logs/taskitem_runs/sprint168_plan_20260225_175406`
+
+All three runs completed with queue-ready taskitems and successful validation.
+
+## Implemented work mapping
+
+### Sprint 166
+
+- Added class/module generation path for `generateCode`:
+  - `editor/src/AgentCodeGen.h`
+- Added production quality scoring helper:
+  - `editor/src/GenerationQualityGates.h`
+- Exposed quality + gate metadata in `generateCode` and `runPipeline` RPC responses:
+  - `editor/src/headless_rpc/DispatchPart1.h`
+  - `editor/src/AgentRPCHandler.h`
+- Added integration summary artifact:
+  - `editor/src/Sprint166IntegrationSummary.h`
+
+### Sprint 167
+
+- Added offline production gate evaluator:
+  - `tools/mcp/evaluate_generated_code_gates.py`
+- Added gate metadata to runtime tool responses (compile/test/placeholder/overall):
+  - `editor/src/headless_rpc/DispatchPart1.h`
+  - `editor/src/AgentRPCHandler.h`
+- Added integration summary artifact:
+  - `editor/src/Sprint167IntegrationSummary.h`
+
+### Sprint 168
+
+- Added closed-loop production completion runner:
+  - `tools/mcp/run_production_completion_loop.sh`
+- Added integration summary artifact:
+  - `editor/src/Sprint168IntegrationSummary.h`
+
+## Verification runs
+
+### Rebuild + promote
+
+- Rebuilt and promoted stable MCP binary:
+  - `editor/build-native/releases/whetstone_mcp_20260225_180207`
+  - `editor/build-native/whetstone_mcp_stable`
+
+### A/B rerun (post-implementation)
+
+- Run directory:
+  - `logs/taskitem_runs/ab_test_ast_vs_language_first_20260226_180215`
+
+Observed result:
+
+- Path A `whetstone_generate_code` now emits class/module output for PriorityQueue spec
+  with gate result `overall_ready=true`.
+- Path B `whetstone_run_pipeline` continues to emit structural class output, but gates
+  correctly flag non-production shape (`overall_ready=false`) due placeholder-like
+  method signatures and incomplete data model.
+
+### Closed-loop production completion
+
+- Run directory:
+  - `logs/taskitem_runs/production_loop_20260225_180220`
+
+Result:
+
+- `overall_ready=true` within iteration budget for PriorityQueue spec.