implement

Implement the work described by the user in the spec or tickets. If the user passes a ticket reference, fetch it from the issue tracker and state its title before starting. If the reference is ambiguous, ask. Call the Skill tool with "tdd" where possible, at pre-agreed seams. Run typechecking regularly, single test files regularly, and the full test suite once at the end. Once done, call the Skill tool with "code-review" to review the work. Commit your work to the current branch.