Merge pull request #10 from jakejars/claude/android-target

Add Android support with platform-specific feature gating

crates/transcription/Cargo.toml

@@ -6,13 +6,19 @@ description = "Speech-to-text engine wrappers, model management, and inference c
 build = "build.rs"
 
 [features]
-# Whisper backend (direct whisper-rs, vulkan-accelerated). Default on —
-# gating it exists so a future Windows non-AVX2 build, or a cloud-only
-# ASR configuration, can drop whisper-rs-sys entirely per brief item
-# #13. Disabling this feature also drops the WhisperRsBackend module
-# and the load_whisper entry point.
-default = ["whisper"]
+# Whisper backend (direct whisper-rs). Default on — gating it exists so
+# a future Windows non-AVX2 build, or a cloud-only ASR configuration,
+# can drop whisper-rs-sys entirely per brief item #13. Disabling this
+# feature also drops the WhisperRsBackend module and the load_whisper
+# entry point.
+#
+# `whisper-vulkan` is a separate feature so a non-Vulkan target (Android
+# without GPU drivers, a CPU-only Windows build) can pull in whisper-rs
+# but skip the Vulkan backend. Build CPU-only with:
+#   cargo build -p kon-transcription --no-default-features --features whisper
+default = ["whisper", "whisper-vulkan"]
 whisper = ["dep:whisper-rs", "dep:num_cpus"]
+whisper-vulkan = ["whisper-rs?/vulkan"]
 
 [dependencies]
 kon-core = { path = "../core" }
@@ -30,8 +36,9 @@ futures-util = "0.3"
 # Download integrity verification
 sha2 = "0.10"
 
-# Gated behind the `whisper` feature (see [features] above).
-whisper-rs = { version = "0.16", default-features = false, features = ["vulkan"], optional = true }
+# Gated behind the `whisper` feature (see [features] above). Vulkan is
+# additive via the `whisper-vulkan` feature so non-GPU targets can drop it.
+whisper-rs = { version = "0.16", default-features = false, optional = true }
 
 # Direct whisper-rs backend (WhisperRsBackend): thread pool sizing.
 # Gated alongside whisper-rs since no other code in this crate needs it.