apps/server/src/checkpointing/Errors.ts                       | 148 +++++++++++++++++++++++++
 apps/server/src/checkpointing/Services/CheckpointCatalog.ts   |  83 ++++++++++++++
 apps/server/src/checkpointing/Services/CheckpointService.ts   |  78 +++++++++++++
 apps/server/src/checkpointing/Services/CheckpointStore.ts     |  95 ++++++++++++++++
 apps/server/src/orchestration/Service.ts                      |   8 +-
 apps/server/src/persistence/Services/OrchestrationEvents.ts   |   7 +-
 apps/server/src/persistence/Services/Projects.ts              |   7 +-
 apps/server/src/provider/Errors.ts                            | 145 +++++++------------------
 apps/server/src/provider/Services/CheckpointStore.ts          |  91 ----------------
 apps/server/src/provider/Services/Codex.ts                    | 110 -------------------
 apps/server/src/provider/Services/CodexAdapter.ts             |  27 +++++
 apps/server/src/provider/Services/Provider.ts                 | 113 -------------------
 apps/server/src/provider/Services/ProviderAdapter.ts          | 104 ++++++++++++++++++
 apps/server/src/provider/Services/ProviderAdapterRegistry.ts  |  37 +++++++
 apps/server/src/provider/Services/ProviderService.ts          | 117 ++++++++++++++++++++
 apps/server/src/provider/Services/ProviderSessionDirectory.ts |  61 +++++++++++
 apps/server/src/provider/contracts.test.ts                    | 187 +++++++++++++++++++++++++-------
 17 files changed, 955 insertions(+), 463 deletions(-)