Refactor session PR flow boundaries and simplify coupling

[ColeMurray]

Summary

• move prompting participant + OAuth token resolution concerns back into SessionDO
• keep SessionPullRequestService focused on PR orchestration (push, branch resolution, artifact writes, PR creation/manual fallback)
• simplify manual fallback code by collapsing multi-helper metadata lookup into one method
• remove unused fallback-reason plumbing between DO and service
• add concise method-level docstrings on service methods and key refactor seams

Tests

• npm run typecheck --workspace @open-inspect/control-plane
• npm run test -- src/session/pull-request-service.test.ts
• npm run test:integration -- test/integration/create-pr.test.ts

[github-actions]

Terraform Validation Results

Step	Status
Format	⚠️
Init	✅
Validate	✅

Note: Terraform plan was skipped because secrets are not configured. This is expected for external contributors. See docs/GETTING_STARTED.md for setup instructions.

Pushed by: @ColeMurray, Action: pull_request

[github-actions]

Terraform Validation Results

Step	Status
Format	⚠️
Init	✅
Validate	✅

Note: Terraform plan was skipped because secrets are not configured. This is expected for external contributors. See docs/GETTING_STARTED.md for setup instructions.

Pushed by: @ColeMurray, Action: pull_request

[greptile-apps]

Greptile Overview

Greptile Summary

Refactored PR creation flow by extracting orchestration logic from SessionDO into a dedicated SessionPullRequestService class. The SessionDO now only handles participant identity and OAuth token resolution, while the service manages branch pushing, artifact creation, and PR API calls.

Key improvements:

• Collapsed multiple manual fallback helpers (getExistingManualBranchArtifact, getCreatePrUrlFromManualArtifact, buildManualPrFallbackResponse) into cleaner service methods (findExistingManualPrUrl, buildManualPrFallbackResult)
• Simplified resolvePromptingUserAuthForPR to return SourceControlAuthContext | null instead of complex union types
• Added comprehensive unit tests (pull-request-service.test.ts) and integration tests (create-pr.test.ts)
• Added documentation for OpenAI model support (docs/OPENAI_MODELS.md)

The refactoring maintains backward compatibility and all tests pass.

[greptile-apps]

_{7 files reviewed, 2 comments}

_{Edit Code Review Agent Settings | Greptile}

[Copilot]

Pull request overview

Refactors the session pull request creation flow by moving PR orchestration into a dedicated SessionPullRequestService, while keeping SessionDO responsible for resolving the prompting participant and OAuth context. Adds new unit/integration coverage for PR creation and documents OpenAI model setup.

Changes:

• Introduce SessionPullRequestService to orchestrate branch resolution, pushes, artifact writes, and PR creation/manual fallback.
• Update SessionDO.handleCreatePR to resolve prompting participant/auth and delegate PR creation to the new service.
• Add integration/unit tests for PR creation flows and add OpenAI model configuration documentation (linked from README and Getting Started).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/control-plane/test/integration/create-pr.test.ts	Adds integration coverage for create-PR endpoint error cases, manual fallback behavior, and artifact handling.
packages/control-plane/src/session/pull-request-service.ts	New service encapsulating PR orchestration (branch resolution, push, artifact writes, PR creation/manual fallback).
packages/control-plane/src/session/pull-request-service.test.ts	Unit tests for the new PR service covering error paths, manual fallback, PR creation, and manual artifact reuse.
packages/control-plane/src/session/durable-object.ts	Delegates PR orchestration to the new service; keeps participant/auth resolution in the DO.
docs/OPENAI_MODELS.md	New guide describing OpenAI model setup via OAuth credentials.
docs/GETTING_STARTED.md	Links to OpenAI model setup guide in the deployment walkthrough.
README.md	Mentions multi-provider model support and links to OpenAI model setup documentation.

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[github-actions]

Terraform Validation Results

Step	Status
Format	⚠️
Init	✅
Validate	✅

Note: Terraform plan was skipped because secrets are not configured. This is expected for external contributors. See docs/GETTING_STARTED.md for setup instructions.

Pushed by: @ColeMurray, Action: pull_request

[github-actions]

Terraform Validation Results

Step	Status
Format	⚠️
Init	✅
Validate	✅

Note: Terraform plan was skipped because secrets are not configured. This is expected for external contributors. See docs/GETTING_STARTED.md for setup instructions.

Pushed by: @ColeMurray, Action: pull_request