apps/server/src/codexAppServerManager.test.ts |  29 +++++
 apps/server/src/codexAppServerManager.ts      |   2 +-
 apps/server/src/filesystemCheckpointStore.ts  |  46 ++++---
 apps/server/src/providerManager.test.ts       | 219 ++++++++++++++++++++++++--------
 apps/server/src/providerManager.ts            |  48 +++----
 apps/web/src/components/ChatView.tsx          |  34 +++--
 apps/web/src/components/DiffPanel.tsx         |  27 ++--
 apps/web/src/components/ui/toggle-group.tsx   |   4 +-
 apps/web/src/hooks/useTurnDiffSummaries.ts    |  35 +++++
 apps/web/src/lib/providerReactQuery.ts        |   8 +-
 apps/web/src/persistenceSchema.test.ts        |  40 ++++++
 apps/web/src/persistenceSchema.ts             |   2 +-
 apps/web/src/session-logic.test.ts            |  71 ++++++++++-
 apps/web/src/session-logic.ts                 | 121 ++++++++++++++++--
 apps/web/src/store.test.ts                    |  17 +++
 apps/web/src/store.ts                         |  16 ++-
 16 files changed, 571 insertions(+), 148 deletions(-)