CLI 5.8.0

Errors now say what went wrong and exit with the code their kind promises, every list prints a table with a header, and agent-to-agent calls carry files and stream to the end from the standalone binary.

A mistake on the command line exits 5 with invalid_usage wherever the command notices it, and an @file that cannot be read names its flag. mf channels test and mf channels register exit 1 when the check fails, as mf doctor does. A plan limit or quota no longer points at your token’s scopes: each code gets a hint with the numbers, such as 2 of 2 on the Free plan, and what to free up, and --json passes its details through.

Every list command prints an aligned table with a header row; --json is unchanged and stays the format for scripts. --help marks the options a command cannot run without, mf channels create --config defaults to {}, and the new mf channels sessions get shows one channel session, archived ones included. Switching to a deleted session now fails with a hint instead of reporting success.

mf a2a send --stream no longer hangs in the standalone mf, and --input-file reaches a Manyfold peer, which reads the file in its workspace. A2A failures exit by kind: an endpoint that does not resolve or answer exits 2 and names it, a peer you hold no grant for exits 4, and a refusal the peer names, such as a sandbox CLI too old for files, keeps its code and hint. Adding a caller that already has a grant suggests --replace-existing.