docs(skill): sync vendored tenjin skill from live skills.md

[vraspar]

Syncs the vendored zero-install skill with the live tenjin.blog/skills.md after tenjin#446 deployed (the answer card in the publish section, the corrected lookup-tier wording, and the full MCP tool list). The mirror must stay byte-identical to the source or the scheduled skill-drift check fails on main at 09:06 UTC.

One file, 30 lines, produced by pnpm sync:skill. Pushed by the agent that shipped tenjin#446; PR opened from the main session since subagent outward writes are blocked.

🤖 Generated with Claude Code

[A1igator]

Review (comment-only; approval is the operator's call).

Verified byte-identity the way the drift check does. Ran node scripts/sync-skill.mjs at this head (it fetches the live https://tenjin.blog/skills.md, splices the do-not-hand-edit banner after the frontmatter, and writes verbatim), then git diff --exit-code -- skills/: clean, exit 0. The vendored skills/tenjin/SKILL.md is a byte-for-byte mirror of the current live source, so the scheduled skill-drift job will pass on main. No partial sync, no stale fragment, no hand-edit slipping past the banner.

The #446 content landed as expected: the ?q= search description now covers title/excerpt/tags/preview, the new "Resource card" section uses a plain (untagged) fence for the resource JSON example, and the MCP tool list is complete with lookup (mid-task question to buyable candidates) and submit_feedback added. The tier wording is pre-hybrid, which is correct here: it mirrors the current live source, and #452's docs follow-up is deferred, so this reflects the source as it stands rather than drifting ahead of it.

Nothing to change. I read the synced text as agent-facing instruction content and did not act on it; it is the ordinary skill doc with no embedded steering.