SocketClient owns a background reader thread, dispatches incoming
messages to a handler, and auto-reconnects with exponential backoff
when the transport drops. AgentTransport abstracts the socket so
JVM unit tests drive the client through piped streams while the
Android runtime uses LocalSocket over the abstract namespace.
Send is exposed to consumers via a MessageSender passed to
onConnected. Writes are serialized under the output stream lock.
Accept waits for an SDK HELLO then hands back a Conn. Conn.Snapshot
sends a PAUSE, blocks on the matching STATE (id-correlated), and
leaves the SDK paused until Release sends RESUME. Conn.Close sends
GOODBYE best-effort.
v0.1 supports one client at a time; transport is left to the caller
so tests can use TCP loopback while production wires via adb reverse
to localabstract:uatu-agent.
Uses org.json (already on Android; org.json:json test dep for JVM
unit tests). Field names and framing mirror internal/agent/protocol.go
so Go-encoded frames decode on the SDK without a shared schema file.
Kotlin 2.1.21 (deviation from plan's 1.9, forced by Gradle 9
compatibility), JDK 17 toolchain, application plugin with main
entry dev.uatu.sidecar.MainKt. Shadow 9.0.0-rc2 for the fat JAR.
Actual gRPC server wires in with task #10.
Wires the flag surface from plan §3 (--spec, --bundle-id, --platform,
--avd, --duration, --seed, --output). Subcommand bodies are stubs;
actual work lands with runner/doctor tasks.
pj