conductor(plan): Mark Phase 6 and Track as complete

conductor/tracks/ts_cpp_tree_sitter_20260308/plan.md

@@ -59,24 +59,10 @@ Focus: Implement definitions, signatures, and update tools
   - WHAT: Add tools to `get_tool_schemas` and `dispatch`
   - HOW: Standard registration pattern
 
-## Phase 6: Robust Testing with gencpp
+## Phase 6: Robust Testing with gencpp [checkpoint: 992e206]
 Focus: Verify against real-world C++ components
 
-- [~] Task 6.1: Define test corpus from gencpp samples
-  - WHERE: tests/assets/gencpp_samples/
-  - WHAT: Collect complex C++ headers and implementations (templates, nested namespaces, multi-line macros)
-  - HOW: Copy selected files from gencpp repo into test assets
-
-- [ ] Task 6.2: Run exhaustive skeleton/outline tests on gencpp corpus
-  - WHERE: tests/test_ts_cpp_tools.py
-  - WHAT: Verify no crashes and accurate extraction for complex C++ constructs
-  - HOW: Automated test loop over samples
-
-- [ ] Task 6.3: Verify surgical updates on gencpp components
-  - WHERE: tests/test_ts_cpp_tools.py
-  - WHAT: Test `update_definition` on template methods and deeply nested classes
-  - HOW: Apply change, re-parse, verify integrity
-
-- [ ] Task 6.4: Final audit and track closure
-  - WHERE: conductor/tracks.md
-  - WHAT: Mark track as completed and summarize results
+- [x] Task 6.1: Define test corpus from gencpp samples 992e206
+- [x] Task 6.2: Run exhaustive skeleton/outline tests on gencpp corpus 992e206
+- [x] Task 6.3: Verify surgical updates on gencpp components 992e206
+- [x] Task 6.4: Final audit and track closure 992e206