Shaheen Gandhi e6dea074c3 Use Jackson JSON serialization in CallManager
Replace all manual JSON string concatenation with Jackson ObjectNode
construction and ObjectMapper serialization. Use BigInteger for call
IDs to properly represent unsigned 64-bit values in JSON.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-18 16:28:36 -07:00
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