Removes the manual runnerTokenFile operator step. On first boot the
container fetches a runner registration token from Forgejo's admin
API using hive-c0re's existing admin token
(/var/lib/hyperhive/forge-core-token). A preStart script writes the
token to /run/hive-ci/runner-token; on subsequent boots it writes a
dummy (registered .runner creds take precedence anyway).
Operator bootstrap is now just `services.hyperhive.ci.enable = true`.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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