chore(agents): install mattpocock skills + per-repo agent config

- 38 skills from mattpocock/skills into .agents/skills/ (symlinked into
  .claude/skills/ for Claude Code)
- skills-lock.json for reproducible installs
- docs/agents/: issue-tracker (Gitea via tea CLI), triage-labels
  (default five-role vocabulary), domain docs (single-context)
- CLAUDE.md: add '## Agent skills' section pointing at docs/agents/
- .gitignore: un-ignore docs/agents/ under the local /docs/* rule

.agents/skills/wait-what/SKILL.md

@@ -0,0 +1,7 @@
+---
+name: wait-what
+description: "Stop. That last message did not land: re-pitch it."
+disable-model-invocation: true
+---
+
+Wait, I don't understand where you've got to here. Re-pitch that: give me a little bit of context, talk in ASD-STE100 Simplified Technical English, and use the ubiquitous language from `CONTEXT.md` (follow `CONTEXT-MAP.md` to the right one if the repo has more than one).

.agents/skills/wait-what/agents/openai.yaml

@@ -0,0 +1,5 @@
+interface:
+  display_name: "Wait What"
+  short_description: "Re-pitch that: simpler, with the context I'm missing"
+policy:
+  allow_implicit_invocation: false