chore: install openagent opencode

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

.opencode/context/core/task-management/guides/managing-tasks.md

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+<!-- Context: core/managing-tasks | Priority: high | Version: 1.0 | Updated: 2026-02-15 -->
+
+# Guide: Managing Task Lifecycle
+
+**Purpose**: Step-by-step workflow for JSON-driven task management
+
+**Last Updated**: 2026-01-11
+
+---
+
+## Prerequisites
+
+- TaskManager agent available
+- Feature folder created in `.tmp/tasks/` (at project root)
+
+---
+
+## Workflow Overview
+
+```
+1. Initiation    → TaskManager creates task.json + subtasks
+2. Selection     → Find eligible tasks (deps satisfied)
+3. Execution     → Working agent implements task
+4. Verification  → TaskManager validates completion
+5. Archiving     → Move to completed/ when done
+```
+
+---
+
+## 1. Initiation (TaskManager)
+
+Create feature folder and files:
+```
+.tmp/tasks/{feature-slug}/
+├── task.json
+├── subtask_01.json
+├── subtask_02.json
+└── subtask_03.json
+```
+
+Validate with: `task-cli.ts validate {feature}`
+
+---
+
+## 2. Task Selection
+
+Find eligible tasks using CLI:
+```bash
+task-cli.ts next {feature}      # All ready tasks
+task-cli.ts parallel {feature}  # Parallelizable only
+```
+
+Selection criteria:
+- `status == "pending"`
+- All `depends_on` tasks have `status == "completed"`
+
+---
+
+## 3. Execution (Working Agent)
+
+When picking up task:
+
+1. Read subtask JSON
+2. Update status:
+   ```json
+   {
+     "status": "in_progress",
+     "agent_id": "coder-agent",
+     "started_at": "2026-01-11T14:30:00Z"
+   }
+   ```
+3. Load `context_files` (lazy)
+4. Implement `deliverables`
+5. Add `completion_summary` (max 200 chars)
+
+---
+
+## 4. Verification (TaskManager)
+
+After agent signals completion:
+
+1. Check each `acceptance_criteria`
+2. If all pass → Mark completed:
+   ```bash
+   task-cli.ts complete {feature} {seq} "summary"
+   ```
+3. If fail → Keep in_progress, report failures
+
+---
+
+## 5. Archiving
+
+When `completed_count == subtask_count`:
+
+1. Update task.json: `status: "completed"`
+2. Move folder: `.tmp/tasks/{slug}/` → `.tmp/tasks/completed/{slug}/`
+
+---
+
+## Status Ownership
+
+| Status | Who Sets | When |
+|--------|----------|------|
+| pending | TaskManager | Initial creation |
+| in_progress | Working agent | Picks up task |
+| completed | TaskManager | After verification |
+| blocked | Either | Dependency/issue found |
+
+---
+
+## CLI Commands Summary
+
+| Command | Use Case |
+|---------|----------|
+| `status` | Quick overview |
+| `next` | What to work on |
+| `parallel` | Batch parallel work |
+| `deps` | Understand blockers |
+| `blocked` | Identify issues |
+| `complete` | Mark task done |
+| `validate` | Health check |
+
+---
+
+## Related
+
+- `../standards/task-schema.md` - JSON field reference
+- `splitting-tasks.md` - How to create subtasks
+- `../lookup/task-commands.md` - Full CLI reference