chore(blob): add bincode dependency and new meta error variants

crates/blob/Cargo.toml

@@ -10,6 +10,7 @@ zstd = "0.13"
 lz4_flex = "0.13.1"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+bincode = "1"
 tracing = "0.1"
 thiserror = "2"
 

crates/blob/src/error.rs

@@ -50,4 +50,10 @@ pub enum Error {
         expected: u64,
         actual: u64,
     },
+
+    #[error("Corrupt metadata file: {0}")]
+    CorruptMeta(String),
+
+    #[error("Unsupported metadata version {version} in {path}")]
+    UnsupportedMetaVersion { path: PathBuf, version: u32 },
 }