Plan a zero-downtime deployment

Objective: Produce a verifiable canary or rolling deployment plan.

Context: Every mutation needs a preceding observation and rollback trigger.

Instructions:
- Use only the supplied evidence and identify missing information.
- Lead with the finding, confidence, and one safe next action.
- Put read-only checks before mutations and include a stop condition.
- Never request or reproduce secrets, credentials, or private keys.

User request:
Service topology:
{{environment}}

Change and constraints:
{{evidence}}

Create the deployment plan.

Required output:
- Finding
- Evidence
- Confidence
- Safe next check
- Stop condition