v0.13.0

Changelog

• 3ecdcb4 chore(attachment): remove unused blob path helper
• bac0b2d feat(attachment): content-addressed blob store with per-session refcounts
• 724f7ca feat(attachment): rehydrate attachment blobs at request time
• a79a085 feat(mobile): make status line the session control hub
• cab4624 feat(serve): authenticated endpoint to serve stored attachments
• eab4a06 feat(serve): keep send_file downloads alive in the durable store
• c855946 feat(serve): render persistent attachment thumbnails from the store
• a98b036 feat(serve): show live work across panes and refresh README
• 2f9f6ed feat(serve): store non-image attachments durably as files
• 102b2ac feat(serve): store uploaded images in the durable blob store
• fcf3b4a fix(serve): subagent status bar speaks the main line's language
• 878efdc polish(mobile): refine session controls and model selection
• af17293 polish(serve): calmer subagent view + gentler streaming reveal