Add setup-matt-pocock-skills; rename github-triage to triage; migrate engineering skills to vague prose

Engineering skills no longer hard-code GitHub or specific label strings.
A new setup skill scaffolds an `## Agent skills` block in
AGENTS.md/CLAUDE.md plus `docs/agents/` so each repo can declare its own
backlog backend, triage label vocabulary, and domain doc layout. Skills
that need the mapping (to-issues, to-prd, triage) point at the setup
skill; skills that only soften with it (diagnose, tdd,
improve-codebase-architecture, zoom-out) stay vague. ADR-0001 records
the split.

Closes #88, #89.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

skills/engineering/triage/SKILL.md

@@ -0,0 +1,103 @@
+---
+name: triage
+description: Triage backlog issues through a state machine driven by triage roles. Use when user wants to create an issue, triage issues, review incoming bugs or feature requests, prepare issues for an AFK agent, or manage issue workflow.
+---
+
+# Triage
+
+Move issues on the project backlog through a small state machine of triage roles.
+
+Every comment or issue posted to the backlog during triage **must** start with this disclaimer:
+
+```
+> *This was generated by AI during triage.*
+```
+
+## Reference docs
+
+- [AGENT-BRIEF.md](AGENT-BRIEF.md) — how to write durable agent briefs
+- [OUT-OF-SCOPE.md](OUT-OF-SCOPE.md) — how the `.out-of-scope/` knowledge base works
+
+## Roles
+
+Two **category** roles:
+
+- `bug` — something is broken
+- `enhancement` — new feature or improvement
+
+Five **state** roles:
+
+- `needs-triage` — maintainer needs to evaluate
+- `needs-info` — waiting on reporter for more information
+- `ready-for-agent` — fully specified, ready for an AFK agent
+- `ready-for-human` — needs human implementation
+- `wontfix` — will not be actioned
+
+Every triaged issue should carry exactly one category role and one state role. If state roles conflict, flag it and ask the maintainer before doing anything else.
+
+These are canonical role names — the actual label strings used on the backlog may differ. The mapping should have been provided to you - run `/setup-matt-pocock-skills` if not.
+
+State transitions: an unlabeled issue normally goes to `needs-triage` first; from there it moves to `needs-info`, `ready-for-agent`, `ready-for-human`, or `wontfix`. `needs-info` returns to `needs-triage` once the reporter replies. The maintainer can override at any time — flag transitions that look unusual and ask before proceeding.
+
+## Invocation
+
+The maintainer invokes `/triage` and describes what they want in natural language. Interpret the request and act. Examples:
+
+- "Show me anything that needs my attention"
+- "Let's look at #42"
+- "Move #42 to ready-for-agent"
+- "What's ready for agents to pick up?"
+
+## Show what needs attention
+
+Query the backlog and present three buckets, oldest first:
+
+1. **Unlabeled** — never triaged.
+2. **`needs-triage`** — evaluation in progress.
+3. **`needs-info` with reporter activity since the last triage notes** — needs re-evaluation.
+
+Show counts and a one-line summary per issue. Let the maintainer pick.
+
+## Triage a specific issue
+
+1. **Gather context.** Read the full issue (body, comments, labels, reporter, dates). Parse any prior triage notes so you don't re-ask resolved questions. Explore the codebase using the project's domain glossary, respecting ADRs in the area. Read `.out-of-scope/*.md` and surface any prior rejection that resembles this issue.
+
+2. **Recommend.** Tell the maintainer your category and state recommendation with reasoning, plus a brief codebase summary relevant to the issue. Wait for direction.
+
+3. **Reproduce (bugs only).** Before any grilling, attempt reproduction: read the reporter's steps, trace the relevant code, run tests or commands. Report what happened — successful repro with code path, failed repro, or insufficient detail (a strong `needs-info` signal). A confirmed repro makes a much stronger agent brief.
+
+4. **Grill (if needed).** If the issue needs fleshing out, run a `/grill-with-docs` session.
+
+5. **Apply the outcome:**
+   - `ready-for-agent` — post an agent brief comment ([AGENT-BRIEF.md](AGENT-BRIEF.md)).
+   - `ready-for-human` — same structure as an agent brief, but note why it can't be delegated (judgment calls, external access, design decisions, manual testing).
+   - `needs-info` — post triage notes (template below).
+   - `wontfix` (bug) — polite explanation, then close.
+   - `wontfix` (enhancement) — write to `.out-of-scope/`, link to it from a comment, then close ([OUT-OF-SCOPE.md](OUT-OF-SCOPE.md)).
+   - `needs-triage` — apply the role. Optional comment if there's partial progress.
+
+## Quick state override
+
+If the maintainer says "move #42 to ready-for-agent", trust them and apply the role directly. Confirm what you're about to do (role changes, comment, close), then act. Skip grilling. If moving to `ready-for-agent` without a grilling session, ask whether they want to write an agent brief.
+
+## Needs-info template
+
+```markdown
+## Triage Notes
+
+**What we've established so far:**
+
+- point 1
+- point 2
+
+**What we still need from you (@reporter):**
+
+- question 1
+- question 2
+```
+
+Capture everything resolved during grilling under "established so far" so the work isn't lost. Questions must be specific and actionable, not "please provide more info".
+
+## Resuming a previous session
+
+If prior triage notes exist on the issue, read them, check whether the reporter has answered any outstanding questions, and present an updated picture before continuing. Don't re-ask resolved questions.