Implement

Implement the work in the spec (docs/specs/<feature>.md) or the ticket the user names. Read it in full first; for a ticket, read its parent spec too.

Where the spec agreed a test seam, drive /tdd at that seam — the seams are already approved, so test at them without re-asking. Where no seam was agreed, implement directly: state explicit verification criteria up front (what observable result proves it works), then verify against them before calling the work done.

Run typechecking regularly, single test files regularly, and the full test suite once at the end.

When working from a ticket, tick its acceptance criteria as each one is verified.

Done when every criterion is verified and the full suite passes → close with a flow pointer (presentation) naming the review tail, all in this session with the working diff as context: /simplify (user-invoked) for an optional quality pass, then /review-gate (user-invoked) — suggest low for a trivial or mechanical diff, high for a large, cross-cutting, or risky one, medium otherwise — then /commit (user-invoked). If context runs low anywhere in that chain, recommend /handoff (user-invoked) and resume in a fresh session instead of pushing on degraded.