[X-LightYear]

Summary

• preserve the optional instanceId when projecting alert rules for rmq.alert.rule.list
• declare the additive field in the MCP output schema
• add deterministic serialization and schema regression coverage

Root cause

AlertRuleListItem.from(AlertRuleVO) dropped AlertRuleVO.instanceId. The tool lists rules across the whole Studio deployment, so the serialized result could not identify the Instance to which a rule was bound.

Fix

Copy the optional instance binding into the MCP projection and document it in the catalog. Global rules continue to omit the field through the existing non-null serialization policy.

Testing

• pre-fix serialization regression failed because instanceId was absent
• AlertRuleListToolHandlerTest: passed
• ToolOutputSchemaContractTest: passed
• Checkstyle: 0 violations
• git diff --check: passed

Fixes #7340