* fix(artifacts): gate agent artifact publishing behind an off-by-default capability
Public artifact sharing was reachable by any agent through `orca artifacts
share`: the Artifacts settings toggle only controlled sidebar visibility, and
nothing in the main process checked a capability before minting a public URL.
Add `artifactSharingEnabled` (default off) and enforce it in
ArtifactCloudService.share/update — before auth, network, or the share-record
write — so the CLI, relay-forwarded remote CLI, and IPC paths are all denied.
The denial carries a stable `artifact_sharing_disabled` code plus next steps
through the RPC error allowlist, so the CLI prints actionable guidance.
list, unshare, and delete stay ungated: turning publishing off must not strand
already-published links. The capability is absent from the `settings.update`
RPC schema, so an agent cannot grant it to itself — only the desktop UI can.
Co-authored-by: Orca <help@stably.ai>
* fix(artifacts): gate agent artifact publishing behind an off-by-default
Publishing is blocked until enabled in Settings → Artifacts. CLI preflights the capability before reading files to avoid unnecessary uploads. RPC surface rejects capability grants so callers cannot self-grant. UI shows opt-in workflow and recovery path when publishing is off. Web clients mirror the host's setting read-only.
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Co-authored-by: Orca <help@stably.ai>
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