Follow-up to the cherry-picked session handshake, rebased onto the
multiplex bridge ownership that landed in #132518:
- connect(): the foreign-session fatal sits ahead of main's
secondary-aware pidfile/port reaping, so neither path signals a bridge
that serves another profile's session.
- Drop the separate "no session -> restart" branch. A bridge without the
field runs an older bridge.js, so its scriptHash already marks it
stale and it restarts through the existing path.
- Inline sessionIdentity() as path.resolve() in /health and drop its
node test, which only exercised path.resolve and no CI lane runs.
- Collapse the four adapter cells into one parametrized invariant (own
session adopted; another session never adopted or killed, connected or
disconnected). The read-receipt test now reports its own session, so
it still restarts for the read-receipt reason rather than a missing
field.
- Docs: fold the separate-gateway guidance into the existing "Multiple
profiles" section instead of a second multi-profile section.
Co-authored-by: Victor Kyriazakos <victor@rocketfueldev.com>
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