Real-Electron Playwright spec for #100406: a two-member room (primary
profile + code-farmer). The user addresses only @code-farmer; its
scripted reply @mentions hermes; the assertion is a `default`-authored
"B" entry in the persisted room log. On origin/main the room settles
after Code Farmer's line and the spec fails at that assertion; with the
mention-alias fix it passes.
The mock inference server gains a per-speaker script for group rooms:
`E2E_SAY(<handle>)[<line>]` tokens in the user's send answer the member
whose turn prompt opens with `You are @<handle>`; unscripted members
reply "(pass)". `{at}` stands for `@` so the script itself never
mentions anyone and round one only drives the member the user tagged.
teknium1
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