Inbox `send` Test Plan Index

Case Files

Case Slug	File	Coverage Note
`send-creates-new-thread`	send-creates-new-thread.md	creates a pending thread with an initial task message
`send-appends-message-to-existing-thread`	send-appends-message-to-existing-thread.md	appends a message to an existing non-terminal thread
`send-reads-body-from-body-file`	send-reads-body-from-body-file.md	reads message body from a file path
`send-attaches-artifact-with-metadata`	send-attaches-artifact-with-metadata.md	persists artifact path, kind, and metadata on send
`send-rejects-invalid-payload-json`	send-rejects-invalid-payload-json.md	rejects malformed payload JSON with `invalid_input`
`send-rejects-invalid-artifact-metadata-json`	send-rejects-invalid-artifact-metadata-json.md	rejects malformed artifact metadata JSON