Synchronous file operations (std::fs) were blocking the async runtime in two locations within the provisioning controller.

Changes

• provision_component: Replaced std::fs::rename with tokio::fs::rename when renaming policy files after component loading
• verify_digest: Made function async and replaced std::fs::read with tokio::fs::read for component digest verification

Example

// Before: blocks async executor
std::fs::rename(&policy_path, &final_policy_path)?;

// After: yields to executor during I/O
tokio::fs::rename(&policy_path, &final_policy_path).await?;

Additional fixes

• Added missing profile field to test fixture constructors in config.rs
• Resolved clippy warnings (needless lifetimes, len_zero)

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