add files

.codex/commands/sprint-contract.md

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+---
+description: Draft or review a step-level generator/evaluator contract before implementation.
+argument-hint: [phase-dir step-number]
+allowed-tools: [Read, Glob, Grep, Edit]
+---
+
+# /sprint-contract
+
+## Arguments
+
+The user invoked this command with: $ARGUMENTS
+
+## Workflow
+
+1. Read `AGENTS.md`, `PLAN.md`, `PROGRESS.md`, `docs/HARNESS.md`, and the target `phases/{phase}/stepN.md`.
+2. Confirm the step has a concrete Sprint Contract:
+   - Done means
+   - Hard thresholds
+   - Files owned
+   - Dependencies
+   - Acceptance commands
+   - Explicit Do Not list
+3. If the contract is missing or vague, edit only the target step file to make the contract executable by a fresh agent.
+4. Do not implement the step.
+
+## Output
+
+- **Target Step**
+- **Contract Status**: ready | updated | blocked
+- **Evaluator Thresholds**
+- **Remaining Ambiguity**