What problem does it solve? It turns approved SDD specs, designs, and task lists into actual code by executing assigned tasks with strict status gating, progress persistence, and optional strict TDD enforcement. ## Core Features & Use Cases - Task Execution from Specs: Reads proposal, spec, design, and tasks artifacts, then implements only the assigned tasks while marking them complete in tasks.md or Engram. - Strict TDD Mode: Conditionally loads a strict-tdd module enforcing RED-GREEN-REFACTOR cycles, triangulation, assertion quality rules, and a TDD evidence table. - Workload and PR Governance: Enforces review workload forecasts, chained/stacked PR strategies, size exceptions, and blocked-state guards before any code is written. - Use Case: An orchestrator assigns Phase 1 tasks 1.1-1.3 of a change; the executor reads the specs, writes the code with tests, persists apply-progress, and returns a structured summary ready for the verify phase. ## Quick Start Delegate the pending tasks for a change to the sdd-apply sub-agent so it implements them according to the specs and design.