Maps the full call flow — NIP-AC event kinds, module layout across
quartz/commons/amethyst, the CallManager state machine, incoming and
outgoing signaling pipelines, group-call invited-vs-watchdog timer
semantics, multi-device "answered elsewhere" handling, and the
load-bearing invariants (stateMutex discipline, self-pubkey guards,
publish-outside-the-lock pattern).
Lives next to CallManager.kt so the next contributor finds it without
an hour of grepping.
https://claude.ai/code/session_01QVUnhr79hYqQuXFiEb8puk
Claude
421b31f84f