Coming in v0.13.0

Transcript sharing will generate a shareable link to the current session, served from the public docs domain. Recipients will read the transcript without authenticating against the source operator's Craik instance.

This slash command is registered as a placeholder. The full implementation lands when v0.13.0 G8 brings the public docs site live.

Workaround until then: use craik session export-portable for a redacted shareable bundle.
