- compareJson now recurses when both nodes are ObjectNode, so nested maps
(tracedProcessors, routeRecording, routeSamplingRates) produce deep paths
like agentConfig.tracedProcessors.proc-1 instead of a blob diff
- Extract nodeToString helper: value nodes use asText() (strips JSON quotes),
null becomes "(none)", arrays/objects get compact JSON
- Apply nodeToString in both diff-emission paths (top-level mismatch + leaf)
- Add three new tests: nullAgentConfigInSnapshot, nestedAgentField_reportsDeepPath,
stringField_differenceValueIsUnquoted (8 tests total, all pass)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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