feat(grilling): add facts vs decisions boundary and confirmation gates

[danielvm-git]

Description

Following updates from Matt Pocock's Skills v1.1, we should enhance our grill-me and grill-with-docs skills.

Proposed Changes

1. Facts vs. Decisions Boundary: Add instructions for the model to distinguish between facts (things discovered by exploring the codebase) and decisions (choices requiring user input). This prevents the agent from "grilling itself" or making assumptions.
2. Strict Confirmation Gate: Append an explicit confirmation gate at the end of the grilling instructions (e.g., "Do not enact the plan or generate specifications until I confirm we have reached a shared understanding.") to prevent models from prematurely transitioning to execution/specs.