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/spec.md

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+# Track Specification: Context Composition Slice Visualization
+
+## Overview
+Enhance slice visualization with visual editor, annotation support (tags/comments), and view presets. This is Phase 2 of the Context Composition Redesign per spec at `docs/superpowers/specs/2026-05-10-context-composition-redesign-design.md`.
+
+## Current State Audit (as of 2026-05-10)
+### Already Implemented
+- [Inspect] button opens AST inspector modal showing AST tree with Def/Sig/Hide toggles
+- [Slices] button opens Text Viewer with file content for slice management
+- FileItem.ast_mask stores mask per AST path (Def/Sig/Hide)
+- FileItem.custom_slices stores user-defined slices with line ranges
+
+### Gaps to Fill (This Track's Scope)
+- Inspect popup shows AST but doesn't show file content with highlighted slices
+- Slices editor is just a list of line ranges - no visual representation
+- No annotation support (tags/comments) for custom slices
+- No view presets (named combinations of view settings)
+- AST-derived slices not shown before user creates custom slice
+
+## Goals
+1. Slice inspector shows file content with AST-derived slices visually highlighted
+2. Custom slices have visual representation (colored ranges) in slice editor
+3. Each slice can have optional tag and comment annotation
+4. View presets allow naming and reusing view configurations
+5. User can toggle which AST elements are included in each view
+
+## Functional Requirements
+### Slice Inspector (replaces Inspect button)
+- Opens as popup showing full file content with line numbers
+- AST-derived slices highlighted with distinct colors:
+  - Sig elements: one color
+  - Def elements: another color
+- User can toggle visibility of each AST element (Def/Sig/Hide)
+- Changes persist to FileItem.ast_mask
+
+### Slice Editor (extends Slices button)
+- Visual file content display (not just line number list)
+- Custom slices shown as colored overlays on the content
+- Click-drag to select line range for new slice
+- Each custom slice has:
+  - Line range
+  - Tag (optional, e.g., "performance", "api", "bug")
+  - Comment (optional, free-text explanation)
+- Remove/edit existing custom slices
+
+### View Presets
+- Named presets defining default view + default slices per file type
+- Examples:
+  - "Debug View" = full text + error-prone line slices
+  - "API Surface" = sig + public API function slices
+- Presets project-scoped, saved in project config
+- User can select preset, then override for specific file
+
+## Architecture Reference
+- `src/gui_2.py:_render_ast_inspector_modal()` - needs enhancement
+- `src/models.py:FileItem.ast_mask` - existing mask storage
+- `src/models.py:FileItem.custom_slices` - needs tag/comment support
+- `docs/superpowers/specs/2026-05-10-context-composition-redesign-design.md`
+
+## Out of Scope
+- Context preset save/load UI (Phase 3)
+- Context preview before send (Phase 3)
+- Changes to Files & Media panel (Phase 1)