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* feat(sandbox): disable the sandbox via config (#687) Add a sandbox.enabled field (`"sandbox": {"enabled": false}`). ModeDisabled already short-circuits the engine but had no config surface. - SandboxConfig.Enabled *bool (pointer distinguishes an explicit false from an omitted key). - mergeConfig honors it (global config / CLI); applyConfiguredSandboxPolicy maps enabled:false to ModeDisabled. - mergeProjectConfig intentionally does NOT merge it: a cloned repo must not be able to disable the sandbox that constrains it — same posture as AdditionalWriteRoots and the Network tighten-only rule. * fix(config): honor sandbox.enabled from the CLI override path (#687 review) applyOverrides copied BlockUnixSockets/MonitorDenials but not the new Enabled tri-state pointer, so a CLI/programmatic Overrides{Sandbox:{Enabled:&false}} was dropped — contradicting the 'global config / CLI can disable' contract. Preserve the pointer in applyOverrides (runs after all config sources, so an explicit override wins) and add a resolver regression test: an explicit false override disables, and an explicit true override wins over a lower-precedence config false. * fix(config): keep sandbox.enabled out of the provider-command path (#687 review) mergeConfig now copies Sandbox.Enabled, and it is shared by two callers: the global-config merge (trusted) and the provider-command merge (not). A provider command is an arbitrary executable named in config, and LoadProviderCommand parses its stdout into a full FileConfig -- so one returning a valid provider plus {"sandbox":{"enabled":false}} could disable the sandbox meant to constrain it, despite the setting being documented as global-config/CLI only. Confirmed reproducible in both directions before the fix. Clear Sandbox.Enabled from the provider-command config before merging, mirroring the carve-out mergeProjectConfig already applies for the same reason. Done at the call site rather than inside mergeConfig because that helper must keep honouring the setting for the trusted global-config merge. Adds TestResolveSandboxEnabledIgnoredFromProviderCommand covering both directions (cannot disable, cannot enable) and asserting the provider itself is still applied, so the guard cannot be satisfied by dropping the command wholesale. --------- Co-authored-by: KRATOS <[email protected]>