Review follow-ups that are logic rather than documentation:
- rpc.schema.ts had lost the credential-rejected branch while api-proxy.ts
still returns that code, so a legitimate business error failed the
client's response parse. Restore the branch and assert it.
- rpc-schemas.spec.ts had lost the workspace list, archiveSession and
insertSessionBefore cases along with the command schemas; those routes
still ship, so restore their coverage.
- An omitted SRC field is now recognized by an absent key instead of an
undefined value, which makes the allowance assertExactArguments already
granted reachable; an explicitly undefined field stays invalid input. A
weak descriptor's undefined result rides the wire as an absent value,
matching the envelope removal.
- The chooser unmounts an already-created backend when the surface entry
fails to load, and no longer reverses the captured id array in place.
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