chore(conductor): Add new tracks for Phase 7

- Add 'structural_file_editor_20260601' track.
- Add 'discussion_metrics_and_compression_20260601' track.

conductor/tracks/structural_file_editor_20260601/index.md

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+# Track structural_file_editor_20260601 Context
+
+- [Specification](./spec.md)
+- [Implementation Plan](./plan.md)
+- [Metadata](./metadata.json)

conductor/tracks/structural_file_editor_20260601/metadata.json

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+{
+  "track_id": "structural_file_editor_20260601",
+  "type": "feature",
+  "status": "new",
+  "created_at": "2026-06-01T00:00:00Z",
+  "updated_at": "2026-06-01T00:00:00Z",
+  "description": "Combine AST Inspector and Slices Editor into a unified Structural File Editor"
+}

conductor/tracks/structural_file_editor_20260601/plan.md

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+# Implementation Plan: Structural File Editor
+
+## Phase 1: Unification
+- [ ] Task: Create Structural File Editor Modal
+    - [ ] Add `app.show_structural_editor_modal = False` to `App.__init__`.
+    - [ ] Create `render_structural_file_editor_modal(app: App)` in `src/gui_2.py`.
+    - [ ] Port the tree rendering logic from `render_ast_inspector_modal` into this new modal.
+    - [ ] Port the custom slice management UI from `render_slices_editor_modal` into this new modal, positioning it logically alongside or above the AST tree.
+- [ ] Task: Update File Row UI
+    - [ ] In `render_context_files_table`, replace the separate "AST" and "Slices" buttons with a single "Structure" button that sets `app.show_structural_editor_modal = True` and sets the target file.
+
+## Phase 2: Verification
+- [ ] Task: Verification
+    - [ ] Open the Structural File Editor for a complex Python file.
+    - [ ] Verify both AST nodes and custom slices are visible and interactive.
+    - [ ] Verify that adding a custom slice works correctly within the unified interface.
+- [ ] Task: Conductor - User Manual Verification 'Phase 2: Verification' (Protocol in workflow.md)

conductor/tracks/structural_file_editor_20260601/spec.md

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+# Specification: Structural File Editor
+
+## 1. Overview
+The user wants to combine the current AST Inspector and Slices Editor into a single, unified "Structural File Editor". This modal will provide a comprehensive visualization of both auto-detected AST elements and user-defined custom slices, allowing users to precisely tailor the context sent to the AI, especially in combination with "skeleton" or other filtered view modes.
+
+## 2. Functional Requirements
+*   **Unified Interface:** Merge the UI elements of `render_ast_inspector_modal` and `render_slices_editor_modal` into a new `render_structural_file_editor_modal`.
+*   **Visualization:** Display a unified graph or list showing the file's structure. This includes AST nodes (classes, functions, etc.) and custom slices seamlessly integrated.
+*   **Custom Slices:** Allow users to define arbitrary text ranges as "custom slices" that exist independently of the AST graph but are visualized alongside it.
+*   **Filtering:** The editor must clearly indicate which parts of the file will be included based on the current `view_mode` (e.g., if `view_mode='skeleton'`, only signatures and explicitly selected custom slices/AST nodes are included).
+
+## 3. Non-Functional Requirements
+*   **Performance:** The unified editor must remain responsive even for large files with complex ASTs.
+
+## 4. Acceptance Criteria
+*   Clicking a "Structure" or "Edit Slices" button on a file opens the new unified modal.
+*   The modal clearly displays both AST elements and custom slices.
+*   Users can add, modify, and delete custom slices within this single interface.