Activates the Anti-Gravity Spec-Driven Development (ag-sdd) workflow. Use this skill when the user asks to implement a feature, fix a bug, or write code in a repository that uses ag-sdd. It enforces a strict 4-phase SDD lifecycle: Discovery, Spec Generation, Sequential Execution, and Quality Signoff.
Specialized SDD Subagent for Phase 4 (Quality Signoff). Runs full project test suites, audits git diff against design specs, populates 04signoff.md, and presents final quality assurance logs.