# Before merge
ls .plan/
# feature-a_plan.md
# feature-b_plan.md

# Merge feature-a complete
rm .plan/feature-a_plan.md

# After
ls .plan/
# feature-b_plan.md  ← Preserved

Create plan
    ↓
Phases reference plan
    ↓
Merge complete
    ↓
Delete plan (cleanup Step 1)

# {{Feature Name}} Implementation Plan

## Overview
- Purpose: {{Why this feature}}
- Scope: {{What's included/excluded}}
- Dependencies: {{Required features/systems}}

## Phases

### Phase 1: {{Phase Name}} ({{Estimated Time}})
**Deliverable:** {{What gets built}}
**Test Criteria:** {{How to verify}}
**Success Criteria:**
- [ ] {{Criterion 1}}
- [ ] {{Criterion 2}}

### Phase 2-N: ...
(Repeat structure)

## Risk Assessment
- **{{Risk Type}}**: {{Description}} → Mitigation: {{Strategy}}

## Architecture Changes
- {{Component}}: {{Change description}}

## Security Considerations
- {{Concern}}: {{How addressed}}

## Testing Strategy
- Unit tests: {{Coverage}}
- Integration tests: {{Scenarios}}
- Performance tests: {{Criteria}}

## Rollback Plan
- {{How to undo changes if needed}}

# Team A working on feature-x
.plan/feature-x_plan.md

# Team B working on feature-y
.plan/feature-y_plan.md

# Team C working on bug-fix-z
.plan/bug-fix-z_plan.md

# Team A merges feature-x
rm .plan/feature-x_plan.md  ← Only delete this one

# Teams B and C continue working
ls .plan/
# feature-y_plan.md
# bug-fix-z_plan.md

## Updates Log

### {{Date}} - {{Reason}}
- {{What changed}}
- {{Why it changed}}
- User approval: {{Yes/No}}