docs: record verified Skill.Info and Agent.Info typings from @opencode/plugin 2.0.29

TODO.md

@@ -48,9 +48,11 @@ State: `.opencode/state/status.md`. Design: `docs/architecture.md`.
 
 ## Open questions
 
-- Exact `Skill.Info`/editor.add field set — check `@opencode/plugin` typings at 1.4.
+- ~~Exact `Skill.Info`/editor.add field set~~ RESOLVED 2026-10-14 (`@opencode/plugin@2.0.29`):
+  `{id, name, description?, autoinvoke?, path, content}`; no `slash` in Info.
 - V2 background subagents: still env-gated? Affects orchestrator dispatch loop wording (1.6).
-- Does `slash` need explicit `true` in editor.add to expose `/name` commands? (1.4 runtime check.)
+- Do plugin-injected skills get `/name` slash exposure (no `slash` field in Skill.Info)? Runtime
+  check at 1.9; fallback = document `skills: ["<pkg-dir>/skills"]` config entry for file-based load.
 - Package name/scope confirmation (1.1).
 - Does nightly runner have network access to github.com for upstream fetch? (1.8 — fallback: mirror
   upstream to Gitea and sync from the mirror.)