Configure the engineering skills against this repo and this KB

The Matt Pocock engineering skills (triage, to-tickets, to-spec, research,
implement) assume per-repo config for three things: where work items live, what
the triage label vocabulary is, and where domain docs sit. Nothing here declared
any of them, so every skill run re-guessed.

Frank's decisions, 2026-10-20: Gitea on Dankclaw as the tracker (no gh, no tea on
any box, so it is recorded as prose — auth via a 600 curl config, the endpoint
table, the 404-on-empty-token / form-encoded-merge / empty-200-on-merge traps,
and the AGENTS.md laws a skill must not renegotiate); the canonical triage label
vocabulary kept as-is, with the five labels created on the tracker (the repo had
zero, so nothing collides); single-context domain docs.

The configuration moved out of the skill's default docs/agents/ and into the one
knowledge base this repo allows: three pages under omp-docs/skills/, an empty
omp-docs/decisions/ carrying the ADR format rule, an "## Agent skills" pointer
block in AGENTS.md, index entries, and a log entry. The glossary is deliberately
not created — every candidate term already has an owner in system/, core/ or
skills/, and a term list that paraphrases them is a second owner of facts already
written down. Known cost: re-running setup-matt-pocock-skills will not recognise
omp-docs/skills/* and will offer to recreate docs/agents/; the AGENTS.md pointer
is what stops that.

Also closes a verification gap found on the way: kb-lint.bats only ever points
the linter at fixtures, so a page with no frontmatter or an index that stops
listing a file passes the suite silently. Two tests now run the linter and the
coverage checker against the shipped omp-docs/ tree.

Refs #18

AGENTS.md

@@ -86,6 +86,28 @@ never committed, only surfaced. Conflicts abort and alert (ntfy); it never
 force-pushes, auto-resolves, or uses `--no-verify`. Details:
 [omp-docs/tools/live-sync.md](omp-docs/tools/live-sync.md).
 
+## Agent skills
+
+The engineering skills (`triage`, `to-tickets`, `to-spec`, `research`,
+`implement`, …) read their per-repo configuration from three pages in the
+knowledge base. Those pages own their facts; this is only the pointer.
+
+### Issue tracker
+
+Work items are Gitea issues on `dank/command-center` (Dankclaw,
+`192.168.0.143:3000`) — no `gh`, no `tea`. See
+[`omp-docs/skills/issue-tracker.md`](omp-docs/skills/issue-tracker.md).
+
+### Triage labels
+
+The five canonical roles, each label string equal to its name. See
+[`omp-docs/skills/triage-labels.md`](omp-docs/skills/triage-labels.md).
+
+### Domain docs
+
+Single-context, inside the existing knowledge base: `omp-docs/glossary.md` and
+`omp-docs/decisions/`. See [`omp-docs/skills/domain-docs.md`](omp-docs/skills/domain-docs.md).
+
 ## Secret gate (HARD rule)
 
 The pre-commit hook (`.githooks/pre-commit`, enabled via