chore: re-sync agent skills to upstream mattpocock/skills

Local snapshots dated 2026-09-16; upstream has moved on since. Refreshes
7 SKILL.md files (code-review, diagnosing-bugs, implement, tdd, grilling,
handoff, teach): tracker-doc references generalized, CONTEXT.md renamed
GLOSSARY.md, implement gains ticket-fetch step + Skill-tool invocation,
grilling question wording rule, handoff names the OS temp dir, teach
workspace-path resolution + quiz answer-position rules, tdd seam notes.
find-skills (vercel-labs) and prototype already current. Skill updates
take effect next session (discovery runs at startup).

agent/skills/implement/SKILL.md

@@ -6,10 +6,12 @@ disable-model-invocation: true
 
 Implement the work described by the user in the spec or tickets.
 
-Use /tdd where possible, at pre-agreed seams.
+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, use /code-review to review the work.
+Once done, call the Skill tool with "code-review" to review the work.
 
 Commit your work to the current branch.