chore(unic-archon-dlc): the vendored Method Bundle is behind upstream; grilling says one-at-a-time where upstream says rounds

What was measured

The vendored Method Bundle and the skills installed in this repository disagree about the shape of a grilling, found 2026-09-02 while grilling #441:

• apps/claude-code/unic-archon-dlc/vendor/mattpocock-skills/skills/productivity/grilling/SKILL.md, line 8: "Ask the questions one at a time, waiting for feedback on each".
• .agents/skills/grilling/SKILL.md (upstream mattpocock/skills as pinned in skills-lock.json), line 8: "Work the tree in rounds. The frontier is every decision whose prerequisites are already settled".

/specs in discuss mode composes the vendored file by path, so every Consumer running it gets the retired one-at-a-time interview. Any criterion that names the interview's shape rots on the next Bundle upgrade.

Why it is its own issue

Root AGENTS.md § The quality bar for a prose Box: upgrading a vendored Method Bundle means diffing the vendored tree against the new upstream tag by hand, in the same commit that moves the pin. Nothing in this repository watches upstream, so the gap is found only when a session reads both files, which is what happened here. #441 must not carry the upgrade: rewriting /specs and moving the Bundle in one change would make neither attributable, and #441 is held until run 3 reports anyway.

Done when

• The vendored Bundle under apps/claude-code/unic-archon-dlc/vendor/mattpocock-skills/ matches one named upstream tag, and the commit that moves it carries the by-hand diff summary the root AGENTS.md asks for.
• grilling/SKILL.md in the Bundle reads the rounds shape, and every other Method the Bundle ships is checked against the same tag, not only the one that surfaced.
• The plugin version is bumped as the pin, per AGENTS.md, and README.md § Dependencies still agrees with what the Boxes and commands read.

Not this ticket

Whether /specs should grill differently is #441.

Start with skills-lock.json and root AGENTS.md, then compare the vendored tree under apps/claude-code/unic-archon-dlc/vendor/mattpocock-skills/ against the pinned upstream tag. Check grilling/SKILL.md and every other shipped Method, then review the plugin version and README.md § Dependencies. Done means the Bundle matches one named tag, the diff summary is recorded, and the version and dependency documentation agree.