buildlisted

# build > Sprint 3 composable skill. Wraps the Builder phase. Builder is the **only** fan-out-incompatible phase — single worktree, single set of mutations. ## When to invoke - After `tdd` has produced RED tests - Cycle is in `tdd` or `discover` phase per cycle-state ## When NOT to invoke - RED tests don't exist (TDD must run first) - Cycle goal is research-only or planning-only ## Workflow | Step | Action | Exit criteria | |---|---|---| | 1 | Read TDD contract from team-context.md | Contract loaded | | 2 | Implement minimum code to turn RED → GREEN | Tests pass locally | | 3 | Run regression suite (`legacy/scripts/utility/run-all-regression-tests.sh`) | No new regressions | | 4 | Write `<workspace>/build-report.md` | Report present + fresh + token-bound | ## Single-writer invariant Builder runs in a worktree with `EVOLVE_BUILDER_WORKTREE` set. Concurrent builders are STRUCTURALLY blocked because: - The trust kernel binds the cycle via SHA256 of `git diff HEAD` - Two concurrent writers would invalidate each other's tree-state SHA - `phase-gate-precondition.sh` allows only one `active_agent` per cycle This is **why Builder cannot fan-out** even though Scout and Auditor can. <!-- GENERATED:phase-facts BEGIN — do not edit; run `evolve skills generate`. Sources: docs/architecture/phase-registry.json · go/internal/phasecontract · .evolve/profiles/builder.json --> ## Phase facts | Fact | Value | |---|---| | Phase | `build` (build archetype, mandatory) | | Persona | `age