docs(skill): clarify work item verification triggers

shared/skills/verification/work-item-verification/SKILL.md

@@ -1,10 +1,18 @@
 ---
 name: work-item-verification
-description: Verify that a work item meets its stated acceptance criteria.
+description: Use when checking whether completed work satisfies explicit scope, constraints, and acceptance criteria; map each criterion to evidence and mark it met, unmet, or unverified.
 ---
 
 # Work Item Verification
 
-Compare the completed change with its requirements and acceptance criteria.
+Use when deciding whether a completed change satisfies a defined work item or review request.
 
-Return passed criteria, failed criteria, checks run, and remaining limitations.
+## Workflow
+
+1. Read the objective, scope boundaries, acceptance criteria, and material constraints.
+2. Map each criterion to direct evidence: changed files, observable behavior, command output, test result, or user-confirmed outcome.
+3. Mark each criterion as met, unmet, or unverified. Do not treat a successful build as proof of unrelated behavioral criteria.
+4. Confirm the implementation stayed within scope and did not leave generated output, documentation, or consumers inconsistent.
+5. Record known limitations, unresolved decisions, and checks that could not run.
+
+Return a criterion-by-criterion result with evidence and a concise completion status. Do not claim completion while a required criterion remains unmet or unverified.