Session Sharing

OB-1 already supports local transcript export:

/export
/export clipboard
/resume

This is the safe first step for sharing because it does not upload code or prompts anywhere. Link-based sharing is a later product surface and should be explicit about what leaves the machine.

Requirements for public share links:

• Show a preview before upload.
• Redact secrets by default.
• Include model route, mode, checks run, and changed files.
• Keep sharing opt-in.
• Let users delete shared sessions.