Channel plugins declare package env triggers in manifests, and ambient
environment variables count as "channel configured". A dev gateway
(gateway run --dev) inherits the operator's shell, so real channel
credentials silently configured channels and could connect development
instances to live services (observed with reef and a Telegram-range
connection during isolated stress testing).
Dev mode now drops presence signals whose only sources are env or
manifest-env across activation planning, auto-enable, autostart, health
recovery, readiness, reloads, and startup warnings. Explicit
channels.<id> config still works, --dev-ambient-channels restores the
old behavior, and startup logs the suppressed channel ids once. Non-dev
gateways are unchanged.
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