Initial commit: Odin editor client + Kotlin daemon prototype

Native SDL3 editor written in Odin with a piece-table buffer core,
backed by a Kotlin/JVM daemon speaking newline-delimited JSON over
localhost TCP for Gradle import, Kotlin/Java diagnostics, and
heuristic completion/hover/definition/references/rename.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,17 @@
+# Gradle / Kotlin build output
+daemon/.gradle/
+daemon/.kotlin/
+daemon/build/
+# Stray kotlinc output from ad-hoc compiles into the module root
+daemon/dev/
+daemon/META-INF/
+
+# Compiled shaders
+client/odin/shaders/compiled/
+
+# Odin build output
+/odin
+client/odin/odin
+
+# Autopilot control file
+.opencode-autopilot-stop