fix(hub): the migration chain runs, and a test says so

`add_email_verification` wrote PostgreSQL's `(now() at time zone 'utc')` as a
literal server default, where every other migration in the chain uses
`sa.func.now()` and lets the dialect render it. On SQLite that is
`sqlite3.OperationalError: near "at": syntax error` — so `meshbay-hub migrate`
could not reach head on the database the suite and the documented local-hub
workflow both use.

Which is how it survived: the only test that ran alembic at all stopped at
`c3d4e5f6a7b8`, the revision immediately before it. The two newest migrations —
email verification, and the mail quota committed two days ago — had been run by
exactly one thing, a production deploy, and the newest by nothing at all.

`test_migrations_reach_head.py` upgrades to head and compares what that built
against `Base.metadata`, both directions: a column in the models and in no
migration never reaches production, and one in the migrations and in no model is
a rename abandoned halfway. Both tests fail on the unfixed migration with the
error above; the drift half was checked by adding a model column on purpose and
watching it be named. The schemas agree today.

It still does not check PostgreSQL-only behaviour — a default, an index type or
a constraint one dialect accepts and the other refuses. Running the chain
somewhere beats running it nowhere, and is not the same as running it where it
ships.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UMxEQadpzPkYLFf5CYKhpW

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