docs: record agent-skills setup (Gitea+tea tracker, triage labels, domain docs)

docs/agents/issue-tracker.md

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+# Issue tracker: Gitea (via tea CLI)
+
+Issues and specs for this repo live as Gitea issues on
+`git.arthurerlich.de/haylan/mattpocock-skills-opencode`. Use the `tea` CLI for all operations;
+the `gitea-tea` skill has command recipes. `tea` infers the repo from `git remote` inside this clone.
+
+**One-time human step (not done yet):** `tea logins add` for `https://git.arthurerlich.de`
+(token from the web UI: Settings → Applications). Until then, tracker operations fail.
+
+## Conventions
+
+- **Create an issue**: `tea issues create -t "<title>" --description-file -` (stdin for
+  multi-line bodies). Labels: `-L needs-triage,bug` (comma-separated; must exist — see Labels).
+- **Read an issue**: `tea issues <number> --comments`.
+- **List issues**: `tea issues list --state open -f index,title,state,labels,assignees`
+  (add `body,comments` to `--fields` when a skill needs full content).
+- **Comment**: `tea comments <number> "<body>"`.
+- **Apply / remove labels**: `tea issues edit <number> -L "<label>"` / `--remove-labels "<label>"`.
+- **Assign**: `tea issues edit <number> -a <username>`.
+- **Close**: comment the reason, then `tea issues close <number>`.
+
+Gitea has **no sub-issues and no native blocked-by links**. Relations are body conventions:
+
+- **Parent/child**: `Part of #<parent>` as the first line of the child body, plus a task list of
+  children in the parent body.
+- **Blocking**: `Blocked by: #<n>, #<n>` near the top of the child body. A ticket is unblocked
+  when every listed blocker is closed.
+
+### Labels
+
+The five triage labels plus `wayfinder:map` and `wayfinder:research|prototype|grilling|task` must
+exist before first use. After login, create missing ones with `tea labels create`; check with
+`tea labels list`.
+
+## Pull requests as a triage surface
+
+**PRs as a request surface: no.** _(Set to `yes` if this repo treats external PRs as feature
+requests; `triage` reads this flag.)_ Gitea shares one number space across issues and PRs: resolve
+a bare `#42` with `tea issues 42`, falling back to `tea prs 42`.
+
+## When a skill says "publish to the issue tracker"
+
+Create a Gitea issue as above.
+
+## When a skill says "fetch the relevant ticket"
+
+Read it with `tea issues <number> --comments`.
+
+## Wayfinding operations
+
+Used by `wayfinder`. The **map** is a single issue with **child** issues as tickets.
+
+- **Map**: issue labelled `wayfinder:map`, holding the Notes / Decisions-so-far / Fog body.
+- **Child ticket**: `Part of #<map>` first body line, listed in the map's task list. Labels:
+  `wayfinder:<type>` (`research`/`prototype`/`grilling`/`task`). Once claimed, assigned to the
+  driving dev.
+- **Blocking**: `Blocked by: #<n>` line (no native equivalent).
+- **Frontier query**: list the map's open children (`tea issues list --state open`), drop any
+  whose `Blocked by:` names an open issue or that has an assignee; first in map order wins.
+- **Claim**: `tea issues edit <n> -a <username>`, the session's first write.
+- **Resolve**: `tea comments <n> "<answer>"`, then `tea issues close <n>`, then append a context
+  pointer to the map's Decisions-so-far (edit the map body).