Why: The frontend appends the confirmation receipt locally so it appears
immediately; returning the server-persisted message (with its id) keeps the
authoritative reconcile duplicate-free.
Evidence: go build green; covered by combo test in Dev.
Impact: response shape gains receipt field (additive).
Refs: proposal 2026-09-30-ui-inbox-command-workspace
Why: The frontend appends the confirmation receipt locally so it appears
immediately; returning the server-persisted message (with its id) keeps the
authoritative reconcile duplicate-free.
Evidence: go build green; covered by combo test in Dev.
Impact: response shape gains receipt field (additive).
Refs: proposal 2026-09-30-ui-inbox-command-workspace
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Why: duplicate-free local receipt append (server id).
Evidence: build green; combo test in Dev.
Impact: additive response field.
Refs: proposal 2026-09-30-ui-inbox-command-workspace