chore: bump workspace version to 0.3.0 (#131)

Aligns the workspace version with the upcoming v0.3.0 release tag.
Last tagged release was v0.2.2; the workspace version had not been
bumped before. This commit catches it up.

Includes the corresponding Cargo.lock churn for all workspace crates.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: powderluv

Cargo.lock

@@ -19,7 +19,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.1.0"
+version = "0.3.0"
 edition = "2021"
 license = "Apache-2.0"
 repository = "https://github.com/ROCm/spur"