feat(run): port-scope macOS sandbox-exec loopback to Firma endpoints#233
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Scope sandbox-exec loopback access to Firma's own ports so the wrapped agent cannot reach other local services.
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## What Documents the loopback egress enforcement model across backends: - `docs-site/src/content/docs/concepts/sandbox.md` — new **Loopback blocking** section (Linux seccomp guard, macOS sandbox-exec port-scope, proxy-only backends), updated network-boundary / proxy-bridge prose, and structural/invariant tables. - `crates/firma-run/src/backend/windows_wsl2.rs` — comment documenting the WSL2/Windows gap: the seccomp guard is Linux-host-only and not wired across the Windows->guest boundary; WSL2 stays proxy-only. `llms.txt` audit-channel + `network.loopback` action-class registry entries land in the branches that own them (#231 base; #232 linux; #233 macOS). ## Stack Based on #231 (audit channel, for the `network.loopback` model). Part of the fir-383 split replacing #216.
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What
macOS experimental
sandbox-execstructural mode: the TrustedBSD MAC profile denies all outbound, then re-allows loopback only to the proxy bridge and DNS stub ports (previously all of loopback was reachable). Other host loopback services are now denied.Structural block only —
sandbox-execdenials are not delivered to the Sidecar, so macOS emits no per-attempt signed audit event (known gap vs the Linux seccomp guard).