Function write_cache 

pub fn write_cache(
    workspace_dir: &Path,
    status: &WorkspaceIndexStatus,
) -> Result<(), WorkspaceError>

Atomically persist status to the aggregate cache for workspace_dir.

Writes to a sibling <status>.json.tmp.<pid>.<nanos> file inside the cache directory and then renames over the canonical path, so a concurrent reader either sees the previous payload or the new one in full (no torn reads). Creates the cache directory if missing.

Errors

Returns WorkspaceError::Io for filesystem failures and WorkspaceError::Serialization when the payload cannot be encoded.

Panics

Panics if cache_path returns a path without a parent directory, which is structurally impossible — cache_path always returns a path with at least three components (<dir>/.sqry/workspace-cache/status.json).