[TheGreatAxios]

The worker's name is bench state in the tenant config key workbench.worker.name (same PATCH mechanism as the description); no redeploy, no hub code.

• The first worker reply ending in a valid Name: <name> line stores the name (when none is stored); the line is stripped at render time.
• Pill, sidebar Workers group, roster, worker page, message headers and drawer show the stored name, "New worker" until then.
• Bench drawer Information tab has an inline Worker rename writing the same key.
• The stock [From: …] header carries only the sender address (the mailbox host's senderAddressFor), so the worker prompt takes the person's name from that header when it has one, else from their entry in the Participants: block the send already appends.
• e2e: reply.test.ts asserts naming, roster, rename and reload persistence.

Upstream gap: the stock mail From has no sender display name the hub fills from the principal.

Resolves CL-9634

[linear-code]

CL-9634