conductor: add phase 6 context composition redesign tracks

- context_comp_decouple_20260510: Decouple Files & Media from Context Composition, directory grouping, file stats
- context_comp_slices_20260510: Slice visualization with annotations, view presets
- context_comp_presets_20260510: Context preset save/load with validation, context preview
- Depends_on chain: presets -> slices -> decouple

conductor/tracks/context_comp_slices_20260510/plan.md

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+# Implementation Plan: Context Composition Slice Visualization
+
+## Phase 1: Slice Data Model Extension
+Focus: Extend custom_slices to support tags and comments
+
+- [ ] Task 1.1: Extend custom_slices schema to include tag and comment fields
+- [ ] Task 1.2: Update FileItem.to_dict() and from_dict() for new fields
+- [ ] Task 1.3: Write tests for custom_slices with annotations
+
+## Phase 2: Slice Inspector Enhancement
+Focus: Visual AST highlighting with file content
+
+- [ ] Task 2.1: Modify _render_ast_inspector_modal() to show file content with highlighted slices
+- [ ] Task 2.2: Add color coding for Sig vs Def elements in file content view
+- [ ] Task 2.3: Implement toggle buttons for each AST element in the content view
+- [ ] Task 2.4: Write tests for slice inspector rendering
+
+## Phase 3: Slice Editor Visual Enhancement
+Focus: Visual slice editor with colored overlays
+
+- [ ] Task 3.1: Enhance slice editor to show file content (not just line list)
+- [ ] Task 3.2: Add colored overlays for custom slices on the content
+- [ ] Task 3.3: Implement click-drag line range selection
+- [ ] Task 3.4: Add tag/comment input for custom slices
+- [ ] Task 3.5: Write tests for slice editor
+
+## Phase 4: View Presets
+Focus: Named view configurations
+
+- [ ] Task 4.1: Create FileViewPreset model
+- [ ] Task 4.2: Add preset selection dropdown to context composition
+- [ ] Task 4.3: Implement preset save/load to project config
+- [ ] Task 4.4: Write tests for view presets
+
+## Phase 5: AST Slice Pre-population
+Focus: Show auto-resolved slices before user customizes
+
+- [ ] Task 5.1: On file add to context, compute AST slices automatically
+- [ ] Task 5.2: Store pre-computed slices in FileItem for display
+- [ ] Task 5.3: User can modify/remove auto-slices
+- [ ] Task 5.4: Write tests for auto-slice computation
+
+## Phase 6: Integration
+Focus: Connect all pieces together
+
+- [ ] Task 6.1: Verify slice data flows correctly through context composition
+- [ ] Task 6.2: Test with C++ files from gencpp
+- [ ] Task 6.3: Conductor - User Manual Verification