docs(grilling): pin the question format and document it

Add the fixed per-question shape (numbered title, body, recommendation
line) to grilling's SKILL.md, sync the docs page, and add a changeset.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.changeset/grilling-question-format.md

@@ -0,0 +1,5 @@
+---
+"mattpocock-skills": patch
+---
+
+Pin the question format in **`grilling`**. Every question in a round is now emitted in one fixed shape — `**Q1** - <title>`, then the body (prose or multiple choices), then a `➡️ **Recommendation:**` line. A round reads as a scannable numbered list with each recommendation visually separated from the question, so you can answer by number instead of quoting questions back.

docs/productivity/grilling.md

@@ -14,7 +14,7 @@ npx skills update grilling
 
 `grilling` is the relentless interview that stress-tests a plan or design before you build it. It maps the plan as a **design tree** — every decision branches into the decisions that hang off it — and works that tree in **rounds** until you and the agent share the same understanding.
 
-Each round asks the whole **frontier**: every decision whose prerequisites are already settled — the questions it can put to you *now* without guessing at answers it hasn't heard yet. Your answers reshape the tree, pushing the frontier outward, and the next round asks whatever that unblocks. Thirteen questions land in a handful of rounds instead of thirteen. Every question comes with the agent's own recommended answer; any *fact* the environment can settle it dispatches to a background sub-agent rather than asking you — and it doesn't block on that research, only the questions downstream of it wait. It won't act on the plan until you confirm the shared understanding has been reached.
+Each round asks the whole **frontier**: every decision whose prerequisites are already settled — the questions it can put to you *now* without guessing at answers it hasn't heard yet. Your answers reshape the tree, pushing the frontier outward, and the next round asks whatever that unblocks. Thirteen questions land in a handful of rounds instead of thirteen. Every question arrives in a fixed shape — numbered and titled (`**Q1** - Storage backend`), then the body, then a `➡️ **Recommendation:**` line — so a round reads as a scannable list and you can answer it by number rather than by quoting it back; any *fact* the environment can settle it dispatches to a background sub-agent rather than asking you — and it doesn't block on that research, only the questions downstream of it wait. It won't act on the plan until you confirm the shared understanding has been reached.
 
 ### Prefer one question at a time?
 

skills/productivity/grilling/SKILL.md

@@ -7,6 +7,14 @@ Interview the user relentlessly until you reach a shared understanding. Map this
 
 Work the tree in **rounds**. The **frontier** is every decision whose prerequisites are already settled — the questions you can ask _now_ without guessing at answers you haven't heard yet. Ask the whole frontier in one round: number each question and give your recommended answer. Then wait for the user's answers before the next round.
 
+Each question should be formatted like so:
+
+```
+**Q1** - <question title>: <question body, might be multiple paragraphs, including multiple choices>
+
+➡️ **Recommendation:** <your recommended answer>
+```
+
 Each round the user answers reshapes the tree — settled decisions push the frontier outward and unblock questions that depended on them. Recompute the frontier and ask the next round. A question whose answer depends on another question still open in this round belongs to a _later_ round, not this one.
 
 Finding _facts_ is your job, never the user's. When a frontier question needs a fact from the environment (filesystem, tools, etc.), dispatch a sub-agent to find it — don't ask the user for anything you could look up yourself. Don't block on it: a running exploration is an unsettled prerequisite, so only the questions downstream of it wait for the sub-agent to report — ask the rest of the frontier now. The _decisions_ are the user's — put each to them and wait.