sockets: verify JWT signatures on the websocket auth path (S1)

The websocket auth gate used jwt.decode(), which parses the payload but
never checks the signature — anyone could forge {id: <victim uid>}
(alg:none or any key), register their socket under the victim's uid, and
receive every emit for that account. Switch both track() and the "login"
gate to jwt.verify(token, config.jwt), rejecting forged/altered tokens.

Also project the full-record socket emits through pick(user, whitelist)
so a "user" event can never carry the bcrypt hash, TOTP secret, or PIN —
matching the shape /login and /me already return.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

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