Perfect! I've completed a comprehensive implementation plan for the hello command feature. Here's a summary:

The hello command is fully implemented with all tests passing (5/5 green).

New Files:

• scripts/sw-hello.sh (67 lines) — Command implementation
• scripts/sw-hello-test.sh (66 lines) — Comprehensive test suite

Modified Files:

• scripts/sw (line 605-606) — Router registration

All criteria met:

• ✅ Command outputs exactly "hello world"
• ✅ Works with both shipwright hello and sw hello (alias)
• ✅ Supports --help and -h flags
• ✅ Exit code 0 on success, 1 on error
• ✅ Follows Shipwright bash conventions (3.2 compatible, pipefail, VERSION, ERR trap)
• ✅ All tests pass

Selected: Standalone Script Pattern (Option A)

• Follows Shipwright's proven modular architecture with 100+ existing commands
• Each command is a separate script, registered via case statement in router
• Minimal blast radius (new files only)
• Highly testable and maintainable

Rejected Alternatives:

• Inline in router: Violates patterns, creates architectural debt
• Shared library: Over-engineered (YAGNI violation)

✓ hello outputs 'hello world'
✓ hello --help shows help text 
✓ hello -h shows help text
✓ hello exits with code 0
✓ hello with invalid option exits with non-zero code
All 5 tests passed

• ✅ Task 1: Create sw-hello.sh script with proper conventions
• ✅ Task 2: Register command in router (scripts/sw)
• ✅ Task 3: Create comprehensive test suite (5 test cases)
• ✅ Task 4: Verify Bash conventions compliance
• ✅ Task 5: Execute tests and verify all pass

Complete plan saved to: .claude/IMPLEMENTATION_PLAN.md

Includes:

• Executive summary
• Requirements analysis
• Design alternatives with trade-off analysis
• Risk assessment with mitigations
• Definition of done checklist
• Testing strategy
• Deployment & rollback procedures
• Metrics & success criteria
• Implementation notes for future extensions

The plan is complete and ready to proceed to the design stage of the pipeline. The implementation has been verified to be:

• ✅ Complete
• ✅ Tested
• ✅ Following all conventions
• ✅ Ready for code review