docs: record agent skill config, symlink CLAUDE.md to AGENTS.md

Adds docs/agents/{issue-tracker,triage-labels,domain}.md so the engineering
skills know where issues live (Gitea via tea, not gh), which triage labels to
apply, and that domain docs are single-context.

Every CLAUDE.md was a stale subset of the AGENTS.md beside it, so each is now
a symlink and AGENTS.md is the single source of truth.

AGENTS.md

@@ -133,6 +133,22 @@ Test: "competent reader get this from code in few sec?" Yes → skip. Needs deto
 
 `golang-code-style`, `golang-error-handling`, `golang-performance`, `golang-testing` for backend Go work.
 
+## Agent skills
+
+`AGENTS.md` is the single source of truth for agent guidance; every `CLAUDE.md` in this repo is a symlink to the `AGENTS.md` beside it. Edit `AGENTS.md`.
+
+### Issue tracker
+
+Issues live as Gitea issues on `gitea.violetcrown.my.id` (`sulthan/mangaBookmark`), driven by the `tea` CLI — not `gh`. See `docs/agents/issue-tracker.md`.
+
+### Triage labels
+
+Default five-role vocabulary, label strings unchanged (`needs-triage`, `needs-info`, `ready-for-agent`, `ready-for-human`, `wontfix`). See `docs/agents/triage-labels.md`.
+
+### Domain docs
+
+Single-context: one root `CONTEXT.md` plus `docs/adr/`, both created lazily. See `docs/agents/domain.md`.
+
 ## graphify
 
 Project has knowledge graph at graphify-out/ with god nodes, community structure, cross-file relationships.