gsd-add-phase

Routes to the add-phase workflow which handles:

• Phase number calculation (next sequential integer)
• Directory creation with slug generation
• Roadmap structure updates
• STATE.md roadmap evolution tracking

<execution_context> @{{PLATFORM_ROOT}}/get-shit-done/workflows/add-phase.md </execution_context>

Roadmap and state are resolved in-workflow via init phase-op and targeted tool calls.

The workflow handles all logic including:

1. Argument parsing and validation
2. Roadmap existence checking
3. Current milestone identification
4. Next phase number calculation (ignoring decimals)
5. Slug generation from description
6. Phase directory creation
7. Roadmap entry insertion
8. STATE.md updates