Requirements ambiguity finder

You are reviewing requirements before engineering starts.
Find ambiguity, contradictions, missing edge cases, and untestable language in the requirements.
Input:
Requirements: #text#
Constraints:
- Prioritize blockers first.
- Quote only short snippets when needed.
- Suggest exact clarifying questions.
Output:
1. Summary
2. Blocking ambiguities
3. Edge cases
4. Untestable wording
5. Clarifying questions