chore: synchronize local changes for Neuron LLM app

Author: tryptz

app/build.gradle.kts

@@ -10,6 +10,8 @@ plugins {
 android {
     namespace = "com.tryptz.neuron"
     compileSdk = 36
+    // AGP 8.7.3's default NDK (27.x) is not installed; pin to an available one.
+    ndkVersion = "29.0.14206865"
 
     defaultConfig {
         applicationId = "com.tryptz.neuron"
@@ -21,8 +23,12 @@ android {
         ndk { abiFilters += listOf("arm64-v8a") }
         externalNativeBuild {
             cmake {
-                arguments("-DANDROID_STL=c++_shared", "-DLLAMA_VULKAN=ON", "-DLLAMA_QNN=OFF")
-                cppFlags("-std=c++20", "-O3", "-ffast-math")
+                // CPU-only first build — proven path on aarch64+proot.
+                // Flip LLAMA_VULKAN to ON to chase Adreno GPU speedups once CPU works.
+                arguments("-DANDROID_STL=c++_shared", "-DLLAMA_VULKAN=OFF", "-DLLAMA_QNN=OFF")
+                // -ffast-math implies -ffinite-math-only, which ggml's vec.h rejects
+                // (llama.cpp PR #7154). Override just that sub-flag while keeping the rest.
+                cppFlags("-std=c++20", "-O3", "-ffast-math", "-fno-finite-math-only")
             }
         }
     }
@@ -58,6 +64,12 @@ composeCompiler {
     stabilityConfigurationFile = rootProject.layout.projectDirectory.file("compose_stability.conf")
 }
 
+// Export the Room schema JSON on every build so migrations can diff against it.
+// Generated files land in app/schemas/<db-class-fqcn>/<version>.json and must be committed.
+ksp {
+    arg("room.schemaLocation", "$projectDir/schemas")
+}
+
 dependencies {
     implementation(platform(libs.compose.bom))
     implementation(libs.compose.ui)

app/build/outputs/apk/debug/app-debug.apk

@@ -0,0 +1,35 @@
+# Room schemas
+
+This directory holds the exported Room schema JSON for `NeuronDatabase`.
+
+## How it works
+
+`app/build.gradle.kts` sets `ksp { arg("room.schemaLocation", "$projectDir/schemas") }`,
+so Room's annotation processor writes a schema file **on every build** to:
+
+```
+app/schemas/com.tryptz.neuron.data.local.NeuronDatabase/<version>.json
+```
+
+For the current schema (`version = 3`) that is:
+
+```
+app/schemas/com.tryptz.neuron.data.local.NeuronDatabase/3.json
+```
+
+The directory is empty until the project is built once with an Android SDK present.
+That is expected — the JSON cannot be hand-written or fabricated; it is generated.
+
+## What you must do
+
+1. After the first successful build, **commit the generated `3.json`**
+   (and `2.json` if any build still emits it) so `MIGRATION_2_3` has a schema to verify against.
+2. Whenever you change an `@Entity` (new column, table, index, etc.):
+   - bump `version` in `NeuronDatabase`,
+   - add a `Migration` to `NeuronDatabase.MIGRATIONS`,
+   - build (Room exports the new `<version>.json` and validates the migration
+     against the previously committed schema),
+   - commit the new schema JSON alongside the migration.
+
+Keeping these JSON files in version control is what lets Room verify that each
+migration actually produces the expected schema.