feat: initial AC telemetry Lua plugin

- CSP Lua app that reads telemetry via ac.* API
- Sends JSON over UDP to configurable target (default 127.0.0.1:5005)
- Purpose-built serializer with zero GC pressure at 60Hz
- Pre-allocated buffer tables, no per-frame allocations
- Graceful fallback when ac global is absent (testing outside AC)
- .gitignore for .idea/

config.lua

@@ -0,0 +1,9 @@
+-- config.lua - UDP target and timing configuration for ACTelemetry
+
+local config = {
+    target_host = "127.0.0.1",
+    target_port = 5005,
+    send_interval = 1 / 60,
+}
+
+return config