Set origin when syncing ExCS projects

[cocomarine]

Status

• Closes https://github.com/RaspberryPiFoundation/digital-editor-issues/issues/1775

Why this bug

• experience_cs is added to origin during authenticated project creation, not sent by ExCS.
• This covers the situation when teacher adds project to class (Lesson::Create#build_copy → Project::Copying.copy_project) and subsequent student remix.
• However, this does not cover Project::Update branch:
  • where project stub already exists for that identifier and locale.
  • where project is migrated using ExperienceCsProjectMigrationsController which does not update origin.

What's changed?

• Set origin for ExCS admin path in Project::Update and its controller.
• Added origin to ExperienceCsProjectMigrationsController#migrate_project!
• Backfill?

[github-actions]

Test coverage

93.57% line coverage reported by SimpleCov.
Run: https://github.com/RaspberryPiFoundation/editor-api/actions/runs/34232492970

[Copilot]

🟢 Approval recommended

The change is narrowly scoped, aligns with existing ExCS origin behavior, and is covered by targeted request and unit specs.

Pull request overview

Ensures Experience CS (ExCS) projects have origin = experience_cs set consistently when they are synced/updated via the ExCS admin/service flows, including migrations, aligning update behavior with existing authenticated creation behavior in the Rails API domain layer.

Changes:

• Pass current_user into Project::Update and set origin when the updater is an ExCS admin/service account.
• Set origin during Experience CS project migration updates.
• Add request/unit specs to cover origin-setting behavior for ExCS update/migration paths and ensure non-ExCS updates don’t set origin.

File summaries

File	Description
spec/requests/projects/update_spec.rb	Adds request coverage to assert origin behavior for ExCS admin/service updates and unchanged origin for normal updates.
spec/requests/experience_cs_project_migrations/update_spec.rb	Extends migration request expectations to include origin: experience_cs.
spec/concepts/project/update_spec.rb	Adds unit coverage for setting origin when current_user is an ExCS admin.
lib/concepts/project/operations/update.rb	Adds current_user input and assigns origin for ExCS admin/service updates.
app/controllers/api/projects_controller.rb	Passes current_user through to Project::Update so the operation can apply ExCS-specific behavior.
app/controllers/api/experience_cs_project_migrations_controller.rb	Sets origin while migrating a stub project into an ExCS project.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 0
• Review effort level: Lite

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