Add structured sections for 'what-to-do' and 'supporting-info' in SKILL.md

Co-authored-by: Copilot <copilot@github.com>

skills/engineering/grill-with-docs/SKILL.md

@@ -3,12 +3,18 @@ name: grill-with-docs
 description: Grilling session that challenges your plan against the existing domain model, sharpens terminology, and updates documentation (CONTEXT.md, ADRs) inline as decisions crystallise. Use when user wants to stress-test a plan against their project's language and documented decisions.
 ---
 
+<what-to-do>
+
 Interview me relentlessly about every aspect of this plan until we reach a shared understanding. Walk down each branch of the design tree, resolving dependencies between decisions one-by-one. For each question, provide your recommended answer.
 
 Ask the questions one at a time, waiting for feedback on each question before continuing.
 
 If a question can be answered by exploring the codebase, explore the codebase instead.
 
+</what-to-do>
+
+<supporting-info>
+
 ## Domain awareness
 
 During codebase exploration, also look for existing documentation:
@@ -78,3 +84,5 @@ Only offer to create an ADR when all three are true:
 3. **The result of a real trade-off** — there were genuine alternatives and you picked one for specific reasons
 
 If any of the three is missing, skip the ADR. Use the format in [ADR-FORMAT.md](./ADR-FORMAT.md).
+
+</supporting-info>