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_decouple_20260510/spec.md

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+# Track Specification: Context Composition Decoupling
+
+## Overview
+Decouple Files & Media from Context Composition, add directory grouping, file stats, and view mode selection per file. This is Phase 1 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
+- Files & Media panel lists project files with wildcards
+- Context Composition panel inherits files from Files & Media
+- View flags (agg/full/sig/def) sync visually between panels
+- `_render_context_composition_panel()` in gui_2.py:2794-2964
+
+### Gaps to Fill (This Track's Scope)
+- Files & Media populates Context Composition automatically (coupled)
+- No directory grouping in file listings
+- No file stats (line count, AST element count)
+- View mode selection is limited (no custom view presets)
+- Context Composition is NOT independent selection - it's derived from Files & Media
+
+## Goals
+1. Make Files & Media and Context Composition independent data sources
+2. Add directory grouping to file listings for compact display
+3. Add file stats per file and aggregate
+4. Implement proper view mode selection (full/sig/def/custom)
+5. User can add/remove files from Context Composition independently
+6. "Add all" and bulk add/remove operations
+
+## Functional Requirements
+- Context Composition starts empty or from saved preset on discussion switch
+- User manually adds files FROM project whitelist (not auto-inherited)
+- Each file entry has: path, view_mode, custom_slices
+- Directory grouping with collapsible headers (`📁 relative/path/`)
+- File stats displayed: line count, AST element count per file
+- Aggregate stats for selection: total files, lines, AST elements
+- View mode dropdown per file: full, sig, def, custom
+- Batch operations: add all from whitelist, remove selected, etc.
+
+## Non-Functional Requirements
+- No horizontal scrolling in file lists (directory grouping enables this)
+- Stats computed asynchronously to not block UI
+- FileItem model may need extension for view_mode field
+
+## Architecture Reference
+- `src/gui_2.py:_render_context_composition_panel()` - main panel
+- `src/models.py:FileItem` - needs view_mode field extension
+- `src/aggregate.py` - respects view modes when composing context
+- `docs/superpowers/specs/2026-05-10-context-composition-redesign-design.md`
+
+## Out of Scope
+- Slice visualization and annotations (Phase 2)
+- Context preset save/load (Phase 3)
+- Context preview before send (Phase 3)