Build mode. Feature: $ARGUMENTS

**Process:**

1. Clarify requirements — infer from context or ask StreamRift if ambiguous
2. Enter plan mode and present a build plan:
   - Files to create/modify
   - Integration points with existing code
   - Key decisions and trade-offs
   - Performance or security considerations (if relevant)
3. Wait for StreamRift to approve or redirect
4. Build it
5. Report what was built with key decisions explained

Use sub-agents for parallel exploration during the planning phase. Build incrementally — working code at each step, not a big bang.
