docs(conductor): replace manual pruner with advanced interactive AST and Slice tracks

conductor/tracks/interactive_ast_tree_masking_20260510/index.md

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+# Track: Interactive AST Tree Masking
+
+- [Specification](./spec.md)
+- [Plan](./plan.md)

conductor/tracks/interactive_ast_tree_masking_20260510/metadata.json

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+{
+  "id": "interactive_ast_tree_masking_20260510",
+  "title": "Interactive AST Tree Masking",
+  "status": "planned"
+}

conductor/tracks/interactive_ast_tree_masking_20260510/plan.md

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+# Implementation Plan: Interactive AST Tree Masking
+
+## Phase 1: AST Mask Model & Inspector UI
+- [ ] Update `FileItem` in `src/models.py` with an `ast_mask: dict[str, str]` field (mapping symbol paths to 'def', 'sig', or 'hide').
+- [ ] In `src/gui_2.py`, add an `[Inspect]` button to the Context Panel table.
+- [ ] Implement `_render_ast_inspector_modal` in `src/gui_2.py`, fetching the outline via `ts_cpp_get_code_outline` and rendering it as an `imgui.tree_node` hierarchy with radio buttons.
+
+## Phase 2: Dynamic Aggregation
+- [ ] Update `src/aggregate.py`. When an `ast_mask` is present, it must parse the file, extract the requested definitions and signatures by their symbol names, and stitch them into a single coherent markdown block.

conductor/tracks/interactive_ast_tree_masking_20260510/spec.md

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+# Specification: Interactive AST Tree Masking
+
+## Overview
+Transform the Context Panel by allowing users to inspect the AST of C/C++ files and selectively mask individual symbols (classes, methods, functions). Instead of treating a file as a single unit, users can define an `ASTMask` to expose only what is relevant.
+
+## Acceptance Criteria
+- [ ] An `[Inspect]` button in the Context Panel opens an AST Outline window for the selected file.
+- [ ] The Outline window renders a hierarchical tree of symbols using `tree-sitter`.
+- [ ] Users can toggle individual nodes as `[Def]` (Definition), `[Sig]` (Signature), or `[Hide]`.
+- [ ] `FileItem` model is updated to persist this `ASTMask` dictionary.
+- [ ] `aggregate.py` dynamically stitches the file content based on the `ASTMask`, automatically resolving line numbers by symbol name to survive agent modifications.