docs(memory): update skills for opencode-memory plugin, deprecate mem0

.sisyphus/notepads/memory-system/decisions.md

@@ -0,0 +1,28 @@
+
+## Task 5: Update Mem0 Memory Skill (2026-02-12)
+
+### Decisions Made
+
+1. **Section Placement**: Added new sections without disrupting existing content structure
+   - "Memory Categories" after "Identity Scopes" (line ~109)
+   - "Dual-Layer Sync" after "Workflow Patterns" (line ~138)
+   - Extended "Health Check" section with Pre-Operation Check
+   - "Error Handling" at end, before API Reference
+
+2. **Content Structure**: 
+   - Memory Categories: 5-category classification with table format
+   - Dual-Layer Sync: Complete sync pattern with bash example
+   - Health Check: Added pre-operation verification
+   - Error Handling: Comprehensive graceful degradation patterns
+
+3. **Validation Approach**: 
+   - Used `./scripts/test-skill.sh --validate` for skill structure validation
+   - All sections verified with grep commands
+   - Commit and push completed successfully
+
+### Success Patterns
+
+- Edit tool works well for adding sections to existing markdown files
+- Preserving existing content while adding new sections
+- Using grep for verification of section additions
+- `./scripts/test-skill.sh --validate` validates YAML frontmatter automatically