v0.2.0: Chipset architecture, platform-agnostic SCSI, no gatekeeping

Breaking changes from v0.1.2:
- PlatformType enum removed, replaced by Chipset (MediaTek, Renesas)
- DriveProfile.platform removed, replaced by .chipset + .unlock_mode + .unlock_buf_id
- DriveProfile.supported field removed — no gatekeeping
- ReadinessStatus enum removed
- DriveMatch enum removed
- SgIoTransport::open() replaced by scsi::open() (platform-agnostic)
- profiles.json: "program" field replaced by "chipset" + "unlock_mode" + "unlock_buf_id"

New:
- scsi::open() with cfg gates for Linux/macOS/Windows
- Compiles on macOS (stub returns platform-not-supported)
- libc dependency conditional on Linux only

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libfreemkv"
-version = "0.1.2"
+version = "0.2.0"
 edition = "2021"
 license = "AGPL-3.0-only"
 description = "Open source raw disc access library for optical drives"
@@ -9,7 +9,6 @@ keywords = ["bluray", "uhd", "optical", "scsi", "disc"]
 categories = ["hardware-support", "multimedia"]
 
 [dependencies]
-libc = "0.2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 sha1 = "0.10"
@@ -17,6 +16,9 @@ aes = "0.8"
 cbc = "0.1"
 flate2 = "1"
 
+[target.'cfg(target_os = "linux")'.dependencies]
+libc = "0.2"
+
 [[bin]]
 name = "freemkv-info"
 path = "src/bin/freemkv_info.rs"