Network isolation is validated working end to end (forge + matrix reach
the gateway under private netns), so the shared-host-netns mode is
removed — there is now one mode.
- hive-network.nix: the bridge/DNS block and the isolation overlay are
now unconditional whenever hyperhive is enabled (gated on
services.hyperhive.enable, not the per-feature toggles). The redundant
isolateContainers-implies-enable guard is dropped.
- network.enable and isolateContainers are kept as DEPRECATED no-op
options so existing configs that set them to true still evaluate
cleanly; setting either to false now warns (gated on hyperhive being
enabled, so a non-hyperhive host gets no spurious warning) and has no
effect. Both are slated for removal in a future release.
- hive-c0re.nix: the HIVE_FORGE_URL / HIVE_MATRIX_URL conditionals drop
the "&& isolateContainers" clause — agents always reach forge/matrix
through the gateway vhost now.
- hive-matrix.nix: refresh one stale comment.
The Rust lifecycle is env-driven (HIVE_NETWORK_ISOLATION), so no Rust
change is needed: the env is now always set, so the existing
private-netns path always runs.
Supersedes the default-on flip (the option it would have defaulted is
gone).
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