docs(conductor): Initialize Phase 6 GenCpp UX Validation tracks

conductor/tracks/granular_ast_control_20260510/spec.md

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+# Specification: Granular AST Control (Signatures vs. Definitions)
+
+## Overview
+Introduce 'AST Signatures' and 'AST Definitions' states in the Context Panel for C/C++ files to allow granular control over context exposure without blowing up token limits.
+
+## Acceptance Criteria
+- [ ] Context panel file items support two new states: `AST Signatures` and `AST Definitions`.
+- [ ] `aggregate.py` respects these states by invoking the `ts_c_get_skeleton` / `ts_cpp_get_skeleton` tools accordingly.
+- [ ] Visual indicators in the UI clearly show the current aggregation state of each file.