fix: remove Cloudflare core export cycle

[lawrencecchen]

Summary

• Move account-store definitions into a leaf module.
• Keep index.ts as a small public barrel and make service.ts import the leaf directly.
• Add a behavior test that exercises the public barrel and service identity through a real route.

This fixes the Bun parallel test failure where the circular index.ts to service.ts graph intermittently reported missing named exports. It does not change routing behavior.

Testing

• bun run typecheck
• bun test packages/core/test
• bun test packages/core/test packages/worker/test --bail=1 (93 pass)
• git diff --check

The first commit contains only the regression test. The second removes the cycle.

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Summary by cubic

Breaks the circular import between index.ts and service.ts in the Cloudflare core package, which intermittently caused missing named exports under Bun's parallel test runner.

• Moves account-store definitions into a new leaf account-store.ts.
• Turns index.ts into a barrel with explicit named re-exports from service.ts and account-store.ts.
• Adds worker/src/core-routing.ts so the worker and its proxy-streaming test mock routing helpers locally instead of via @subrouter/core.
• Adds a regression test asserting the barrel exposes one coherent service and account-store API through a real route.
• Routing behavior and the public exports are unchanged.

^{Written for commit bf8e853. Summary will update on new commits.}

Summary by CodeRabbit

• New Features

  • Added account selection based on model quotas, availability, organization matching, preferences, sticky sessions, and balanced distribution.
  • Added usage tracking to inform subsequent account routing decisions.
  • Exposed account and account-store capabilities through the core package’s public API.

• Bug Fixes

  • Improved consistency between core package exports and service functionality.

• Tests

  • Added coverage for public exports and account-based request routing.

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• cloudflare/packages/worker/src/core-routing.ts
• cloudflare/packages/worker/src/index.ts
• cloudflare/packages/worker/test/proxy-streaming.test.ts

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📝 Walkthrough

Walkthrough

Changes

Account Store and Core Integration

Layer / File(s)	Summary
Account and quota contracts cloudflare/packages/core/src/account-store.ts	Adds public account and quota types, model quota resolution, eligibility checks, and the AccountStore Effect contract.
In-memory account selection cloudflare/packages/core/src/account-store.ts	Adds sticky-session storage, organization filtering, preferred-account selection, round-robin fallback, and lastUsedAt updates.
Core exports and routing validation cloudflare/packages/core/src/index.ts, cloudflare/packages/core/src/service.ts, cloudflare/packages/core/test/public-api.test.ts	Updates service imports and explicit core exports, and validates public exports and routing behavior.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 03ce1

The change removes the circular import while preserving public exports and routing behavior, with regression coverage and passing checks; no actionable merge-blocking risk remains.

Sequence Diagram(s)

sequenceDiagram
  participant Request
  participant SubrouterService
  participant AccountStore
  participant StickySessionStore
  Request->>SubrouterService: route with orgId and sessionId
  SubrouterService->>AccountStore: pick account
  AccountStore->>StickySessionStore: check sticky assignment
  StickySessionStore-->>AccountStore: account or no assignment
  AccountStore-->>SubrouterService: selected account or null
  SubrouterService-->>Request: routing result

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Suggested reviewers: austinywang, azooz2003-bit

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: removing the Cloudflare core export cycle.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4 files.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

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• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/cloudflare-core-export-cycle

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Actionable comments posted: 1

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Inline comments:
In `@cloudflare/packages/core/src/account-store.ts`:
- Line 2: Remove the `export * from "./service.ts"` statement from
`account-store.ts`; `index.ts` already exposes `service.ts`, and eliminating
this re-export breaks the circular dependency between the account-store module
and `service.ts`.

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Reviewing files that changed from the base of the PR and between 038bebd and 744269c.

📒 Files selected for processing (4)

• cloudflare/packages/core/src/account-store.ts
• cloudflare/packages/core/src/index.ts
• cloudflare/packages/core/src/service.ts
• cloudflare/packages/core/test/public-api.test.ts

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