sync: vendor mattpocock/skills @49dd158 (v1.3.1) with sync tooling

upstream/skills/engineering/implement/SKILL.md

@@ -0,0 +1,17 @@
+---
+name: implement
+description: "Implement a piece of work based on a spec or set of tickets."
+disable-model-invocation: true
+---
+
+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.