conductor(tracks): Add two deferred future tracks

- aggregation_smarter_summaries: Sub-agent summarization, hash-based caching
- system_context_exposure: Expose hidden _SYSTEM_PROMPT for user customization

conductor/tracks/aggregation_smarter_summaries_20260322/plan.md

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+# Implementation Plan: Smarter Aggregation with Sub-Agent Summarization
+
+## Phase 1: Hash-Based Summary Cache
+Focus: Implement file hashing and cache storage
+
+- [ ] Task: Research existing file hash implementations in codebase
+- [ ] Task: Design cache storage format (file-based vs project state)
+- [ ] Task: Implement hash computation for aggregation files
+- [ ] Task: Implement summary cache storage and retrieval
+- [ ] Task: Add cache invalidation when file content changes
+- [ ] Task: Write tests for hash computation and cache
+- [ ] Task: Conductor - User Manual Verification 'Phase 1: Hash-Based Summary Cache'
+
+## Phase 2: Sub-Agent Summarization
+Focus: Implement sub-agent summarization during aggregation
+
+- [ ] Task: Audit current aggregate.py flow
+- [ ] Task: Define summarization prompt strategy for code vs text files
+- [ ] Task: Implement sub-agent invocation during aggregation
+- [ ] Task: Handle provider-specific differences in sub-agent calls
+- [ ] Task: Write tests for sub-agent summarization
+- [ ] Task: Conductor - User Manual Verification 'Phase 2: Sub-Agent Summarization'
+
+## Phase 3: Tiered Aggregation Strategy
+Focus: Respect tier-level aggregation configuration
+
+- [ ] Task: Audit how tiers receive context currently
+- [ ] Task: Implement tier-level aggregation strategy selection
+- [ ] Task: Connect tier strategy to Persona configuration
+- [ ] Task: Write tests for tiered aggregation
+- [ ] Task: Conductor - User Manual Verification 'Phase 3: Tiered Aggregation Strategy'
+
+## Phase 4: UI Integration
+Focus: Expose cache status and controls in UI
+
+- [ ] Task: Add cache status indicator to Files & Media panel
+- [ ] Task: Add "Clear Summary Cache" button
+- [ ] Task: Add aggregation configuration to Project Settings or AI Settings
+- [ ] Task: Write tests for UI integration
+- [ ] Task: Conductor - User Manual Verification 'Phase 4: UI Integration'
+
+## Phase 5: Cache Persistence & Optimization
+Focus: Ensure cache persists and is performant
+
+- [ ] Task: Implement persistent cache storage to disk
+- [ ] Task: Add cache size management (max entries, LRU)
+- [ ] Task: Performance testing with large codebases
+- [ ] Task: Write tests for persistence
+- [ ] Task: Conductor - User Manual Verification 'Phase 5: Cache Persistence & Optimization'