Pantheon v0.2.6 — shared runtime and recovery

Pantheon now shares stable workspace data, durable task status and recovery across CLI and Web.

• Source-labelled summaries preserve continuation context for long multi-agent outputs. Original step outputs remain in the returned results; summary calls add normal model usage.
• Installers and CI use hashed runtime dependency locks.
• Existing project data/configuration remain in place. New workspaces use platform application-data paths; inspect them with pantheon --workspace <path> paths.
• One background Web runtime per workspace; task status, cross-process stop requests, stored results and interrupted-owner recovery are shared.
• View results with pantheon tasks --show <id> or Settings → Info → View result. Stored answers are capped at 200,000 characters, with excerpt notices when needed.
• Offline backup/restore includes consistent SQLite snapshots, maintenance exclusion and recovery copies. Stop the Web service and finish running tasks before pantheon backup <archive.zip> or pantheon restore <archive.zip>.

Saved models and the compact Web layout are preserved. Native Windows installation/service support, first-start onboarding, secure credential storage and configurable cost limits remain upcoming before desktop development.

See PR #22 and the core-readiness guide for details.