[codex] migrate Effect.fn in apps/server/src/checkpointing/Layers/CheckpointStore.ts

[juliusmarminge]

Summary

• migrate the remaining () => Effect.gen(...) wrapper in apps/server/src/checkpointing/Layers/CheckpointStore.ts to Effect.fn
• keep this PR scoped to a single file as part of the checklist split

Why

• finish the remaining checklist migrations without batching multiple files into one review
• keep exact-empty-arg Effect.gen wrappers out of the codebase

Validation

• bun fmt
• bun lint
• packages/shared: bun run test src/DrainableWorker.test.ts
• apps/server: bun run test src/provider/Layers/EventNdjsonLogger.test.ts src/provider/Layers/ProviderRegistry.test.ts src/provider/Layers/ProviderService.test.ts src/provider/Layers/ProviderAdapterRegistry.test.ts src/keybindings.test.ts src/open.test.ts
• apps/server: bun run test src/orchestration/projector.test.ts
• apps/server: bun run test src/orchestration/Layers/OrchestrationEngine.test.ts -t "returns deterministic read models for repeated reads"
• apps/server: bun run test src/orchestration/Layers/OrchestrationEngine.test.ts -t "archives and unarchives threads through orchestration commands"
• apps/server: bun run test src/orchestration/Layers/OrchestrationEngine.test.ts -t "streams persisted domain events in order"

Notes

• validation was run from the completed checklist scratch branch before splitting these per-file PRs
• bun run test and bun typecheck at the repo root currently fail in apps/web because @effect/atom-react cannot be resolved
• apps/server still has unrelated pre-existing typecheck failures outside this file

Note

Migrate checkpoint functions in CheckpointStore.ts to named Effect.fn

Wraps captureCheckpoint, restoreCheckpoint, diffCheckpoints, and deleteCheckpointRefs in CheckpointStore.ts with Effect.fn("<name>") instead of anonymous Effect.gen calls. No logic, control flow, or error handling changes.

^{Macroscope summarized 2e848bc.}

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Note

Low Risk
Pure refactor of checkpointing layer functions to use Effect.fn instead of anonymous Effect.gen wrappers, with no intended behavior changes. Risk is low and mainly limited to potential subtle differences in effect naming/stack traces.

Overview
Migrates the remaining checkpointing operations in CheckpointStore.ts from anonymous Effect.gen wrappers to named Effect.fn forms (including an inner captureCheckpoint.withTempDirectory). This standardizes effect naming for captureCheckpoint, restoreCheckpoint, diffCheckpoints, and deleteCheckpointRefs without changing the underlying Git commands, control flow, or error handling.

^{Written by Cursor Bugbot for commit 2e848bc. This will update automatically on new commits. Configure here.}

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