Add Needed Improvements section to all docs

Documented 6 areas needing improvement:
- Semantic Deduplication (High)
- Search Result Deduplication (Medium)
- Gem Quality Scoring (Medium)
- Temporal Decay (Low)
- Gem Merging/Updating (Low)
- Importance Calibration (Low)

README.md

@@ -65,6 +65,19 @@ After:  Watching current session (93dc32bf... from Feb 25) ✅
 
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+## Needed Improvements
+
+| Issue | Description | Priority |
+|-------|-------------|----------|
+| **Semantic Deduplication** | No dedup between similar gems. Same fact phrased differently creates multiple gems. Need semantic similarity check before storage. | High |
+| **Search Result Deduplication** | Similar gems both above threshold are both injected, causing redundancy. Need filter to remove near-duplicates from results. | Medium |
+| **Gem Quality Scoring** | No quality metric. Some extracted gems may be low value. Need LLM-based quality scoring. | Medium |
+| **Temporal Decay** | All gems treated equally regardless of age. Should weight recent gems higher. | Low |
+| **Gem Merging/Updating** | When user changes preference, old gem still exists. Need mechanism to update/contradict old gems. | Low |
+| **Importance Calibration** | All curator gems marked "medium" importance. Should dynamically assign based on significance. | Low |
+
+---
+
 ## Overview
 
 TrueRecall v2 extracts "gems" (key insights) from conversations and injects them as context. It consists of three layers: