chore: install openagent opencode

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

.opencode/context/core/workflows/design-iteration-plan-iterations.md

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+<!-- Context: workflows/design-iteration-plan-iterations | Priority: high | Version: 1.0 | Updated: 2025-12-09 -->
+# Handling Plan File Edits and Iterations
+
+## User Edits Plan File Directly
+
+**Scenario**: User opens `.tmp/design-plans/{name}.md` and makes changes
+
+**Process**:
+1. User edits plan file (changes requirements, adds constraints, modifies goals)
+2. User notifies agent: "I've updated the plan file"
+3. Agent reads updated plan file
+4. Agent identifies what changed
+5. Agent proposes how to incorporate changes
+6. Agent updates affected stages
+
+**Example**:
+```
+User: "I've updated the plan file - changed the color scheme to dark mode"
+
+Agent: 
+✅ Read updated plan: .tmp/design-plans/saas-landing-page.md
+
+Changes detected:
+- Color scheme: Light → Dark mode
+- Primary color: Blue → Purple
+
+This affects:
+- Stage 2 (Theme) - needs regeneration
+- Stage 4 (Implementation) - needs CSS update
+
+Would you like me to:
+1. Regenerate theme with dark mode
+2. Update implementation with new theme
+```
+
+---
+
+## Iteration Within a Stage
+
+**Scenario**: User requests changes during a stage
+
+**Process**:
+1. Agent presents stage output (e.g., layout wireframe)
+2. User requests changes: "Make the hero section taller"
+3. Agent updates plan file with feedback
+4. Agent makes changes
+5. Agent updates plan file with new iteration
+6. Agent presents updated output
+
+**Example**:
+```
+Stage 1 - Layout Design
+
+Agent: [presents wireframe]
+
+User: "Make the hero section taller and move CTA above the fold"
+
+Agent:
+✅ Updated plan file with feedback
+✅ Revised layout wireframe
+✅ Updated plan file with Iteration 2
+
+[presents updated wireframe]
+```
+
+---
+
+## Tracking Iterations in Plan File
+
+**Format**:
+```markdown
+## Design Evolution
+
+### Iteration 1 - Initial Layout
+- Date: 2026-01-30T10:00:00Z
+- Stage: Layout
+- Changes: Initial wireframe created
+- User feedback: "Hero section too short, CTA below fold"
+
+### Iteration 2 - Revised Layout
+- Date: 2026-01-30T10:15:00Z
+- Stage: Layout
+- Changes: Increased hero height from 400px to 600px, moved CTA above fold
+- User feedback: "Perfect! Approved."
+- Status: ✅ Approved
+
+### Iteration 3 - Theme Adjustment
+- Date: 2026-01-30T10:30:00Z
+- Stage: Theme
+- Changes: Changed from light to dark mode, primary color blue → purple
+- User feedback: "Love the dark mode!"
+- Status: ✅ Approved
+```
+
+---
+
+## Subagent Context Preservation
+
+**Problem**: Subagents lose context between calls
+
+**Solution**: Always pass plan file path
+
+**Pattern**:
+```javascript
+// When delegating to subagent
+task(
+  subagent_type="OpenFrontendSpecialist",
+  description="Implement Stage 4",
+  prompt="Load design plan from .tmp/design-plans/saas-landing-page.md
+  
+  Read the plan file for:
+  - All approved decisions from Stages 1-3
+  - User requirements and constraints
+  - Design evolution and iterations
+  
+  Implement Stage 4 (Implementation) following all approved decisions.
+  
+  Update the plan file with:
+  - Output file paths
+  - Implementation status
+  - Any issues encountered"
+)
+```
+
+---
+
+## Plan File as Single Source of Truth
+
+### Benefits
+
+- ✅ All design decisions in one place
+- ✅ User can review and edit anytime
+- ✅ Subagents have full context
+- ✅ Design history preserved
+- ✅ Easy to iterate and refine
+- ✅ No context loss between stages
+
+### Best Practices
+
+- Always read plan file at start of each stage
+- Update plan file after every user interaction
+- Track all iterations with timestamps
+- Document user feedback verbatim
+- Mark approved decisions clearly
+- Pass plan file path to all subagents
+
+---
+
+## Related Files
+
+- [Overview](./design-iteration-overview.md)
+- [Design Plan File](./design-iteration-plan-file.md)
+- [Best Practices](./design-iteration-best-practices.md)