v0.7.0

• Add durable task dependency graphs and task groups with explicit completion
  policies and retained execution obligations.
• Add collaboration participant identities, namespaces, lifecycle controls, and
  durable request acceptance, admission, and observation foundations.
• Add authorized durable session exports with exact content-release controls.
• Support governed credentialless browser research, revision-bound rendered-text
  readback, and source-bound image region inspection.
• Add experimental TypeSafe provider support and include the Codex client version
  in subscription URLs. Preserve safe, actionable provider and command diagnostics.
• Keep native eval workers busy with durable case claims, isolate process-case
  cancellation, and retain safe workflow failure diagnostics and versioned history
  anchors. Reduce repeated checkpoint validation and support explicit best-effort
  retained compaction targets.
• Remove routine CI diagnostic uploads, retain required release archives for
  three days, and share task-group maintenance scans across workers on each store.

Upgrade from v0.6.1

This release requires storage revision 96 (previously 90) and server
contract 46 (previously 44). Manifest/generator schema 17 is unchanged.
Inspect existing stores with cayu storage status and follow the storage migration
guidance before upgrading. Upgrade all writers together, refresh generated clients,
and validate the complete application before adoption.