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Add a `group` option to the netpool NixOS module + BOT_BOTTLE_FC_GROUP to the shell script: when set, the pool's TAP devices are owned by a group instead of a single user, so any group member can open them (the kernel lets a TAP's owning-group members attach). This lets an interactive user and, say, a CI-runner user share one pool. `owner`/`group` are mutually exclusive (asserted). Single-user `owner` remains the default. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck