chore: install openagent opencode

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.opencode/context/core/workflows/task-delegation-caching.md

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+<!-- Context: workflows/delegation-caching | Priority: medium | Version: 1.0 | Updated: 2026-02-05 -->
+# Context Caching for Delegation
+
+**Purpose**: Cache discovered context to avoid re-discovery overhead in repeated tasks
+
+---
+
+## When to Cache
+
+Cache context when:
+- Same task type appears multiple times in session
+- Same context files needed repeatedly
+- Multiple subtasks use identical standards
+- Parallel tasks need same context
+
+---
+
+## Cache Structure
+
+```
+.tmp/sessions/{session-id}/
+├── context.md (main session context)
+├── .cache/
+│   ├── test-coverage.md (cached from .opencode/context/)
+│   ├── code-quality.md
+│   └── code-review.md
+└── .manifest.json (tracks cache status)
+```
+
+---
+
+## Cache Manifest
+
+```json
+{
+  "session_id": "2026-01-28-parallel-tests",
+  "created_at": "2026-01-28T14:30:22Z",
+  "cache": {
+    "test-coverage.md": {
+      "source": ".opencode/context/core/standards/test-coverage.md",
+      "cached_at": "2026-01-28T14:30:25Z",
+      "used_by": ["subtask_01", "subtask_02"],
+      "status": "valid"
+    }
+  }
+}
+```
+
+---
+
+## Invalidation Rules
+
+**Cache is INVALID when:**
+- Source file modified (check timestamp)
+- Session older than 24 hours
+- Context file version changed
+- User explicitly requests refresh
+
+**Cache is VALID when:**
+- Source timestamp matches
+- Session less than 24 hours old
+- No version changes
+- Multiple tasks in same session
+
+---
+
+## Implementation Pattern
+
+```javascript
+// Before delegating to subagent
+IF cache exists AND cache is valid:
+  USE cached context file
+  SKIP re-reading from .opencode/context/
+ELSE:
+  READ from .opencode/context/
+  CACHE the file
+```
+
+---
+
+## Example: Parallel Tasks
+
+```javascript
+session_id = "2026-01-28-parallel-tests"
+
+// Task 1: Write component A (parallel)
+task(
+  subagent_type="CoderAgent",
+  description="Write component A",
+  prompt="Load context from .tmp/sessions/{session_id}/context.md
+          Use cached context if available at .cache/"
+)
+
+// Task 2: Write component B (parallel)  
+task(
+  subagent_type="CoderAgent",
+  description="Write component B",
+  prompt="Load context from .tmp/sessions/{session_id}/context.md
+          Use cached context if available at .cache/"
+)
+
+// Result: Task 1 caches context, Task 2 uses cache (faster)
+```
+
+---
+
+## Cache Effectiveness
+
+Track metrics:
+```json
+{
+  "cache_stats": {
+    "total_reads": 15,
+    "cache_hits": 9,
+    "cache_misses": 6,
+    "hit_rate": "60%"
+  }
+}
+```
+
+---
+
+## Best Practices
+
+✅ **Do:**
+- Cache context for repeated task types
+- Validate cache before using
+- Invalidate when source changes
+- Monitor hit rate
+- Clean up cache with session
+
+❌ **Don't:**
+- Cache external context (always fetch fresh)
+- Cache for single-task sessions (overhead not worth it)
+- Ignore invalidation rules
+- Mix cached and fresh context in same task
+
+---
+
+## Related
+
+- `task-delegation-basics.md` - Core delegation workflow
+- `task-delegation-specialists.md` - When to delegate