chore: install openagent opencode

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

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

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+<!-- Context: core/splitting-tasks | Priority: high | Version: 1.0 | Updated: 2026-02-15 -->
+
+# Guide: Splitting Features into Tasks
+
+**Purpose**: How to decompose features into atomic subtasks
+
+**Last Updated**: 2026-01-11
+
+---
+
+## Prerequisites
+
+- Feature request understood
+- Context bundle loaded (project standards, patterns)
+
+---
+
+## Steps
+
+### 1. Identify Atomic Boundaries
+
+Break feature into tasks that are:
+- Completable in 1-2 hours
+- Have single, clear outcome
+- Testable independently
+- Don't overlap with other tasks
+
+**Bad**: "Implement authentication" (too big)
+**Good**: "Create password hashing utility" (atomic)
+
+---
+
+### 2. Map Dependencies
+
+For each task, ask:
+- What must exist before this can start?
+- What files/APIs does this need?
+
+```
+01 → no deps (can start immediately)
+02 → depends_on: ["01"]
+03 → depends_on: ["01", "02"]
+```
+
+---
+
+### 3. Identify Parallel Tasks
+
+Mark `parallel: true` when:
+- Task doesn't modify shared files
+- Task doesn't depend on runtime state from other tasks
+- Multiple agents could work simultaneously
+
+Example parallel tasks:
+- Writing independent unit tests
+- Creating isolated utility functions
+- Documentation for separate features
+
+---
+
+### 4. Define Acceptance Criteria
+
+Binary pass/fail conditions only:
+- "JWT tokens signed with RS256" ✓
+- "Tests pass" ✓
+- "Code is clean" ✗ (subjective)
+
+---
+
+### 5. Specify Deliverables
+
+Concrete files/endpoints:
+- `src/auth/hash.ts`
+- `POST /api/login`
+- `tests/auth.test.ts`
+
+---
+
+### 6. Reference Context Files
+
+Don't embed descriptions. Reference paths:
+```json
+"context_files": [
+  "(example: .opencode/context/development/backend/auth/jwt-patterns.md)"
+]
+```
+
+---
+
+## Verification Checklist
+
+- [ ] Each task completable in 1-2 hours?
+- [ ] Dependencies create valid execution order?
+- [ ] Parallel tasks correctly identified?
+- [ ] Acceptance criteria are binary?
+- [ ] Deliverables are concrete files/endpoints?
+
+---
+
+## Common Mistakes
+
+| Mistake | Fix |
+|---------|-----|
+| Task too big | Split into 2-3 smaller tasks |
+| Circular deps | Re-order or merge tasks |
+| Missing deps | Run `task-cli.ts validate` |
+| Vague criteria | Make binary pass/fail |
+
+---
+
+## Related
+
+- `../standards/task-schema.md` - JSON field reference
+- `managing-tasks.md` - Lifecycle workflow
+- `../lookup/task-commands.md` - CLI reference