CONV-251/252: Test and implement subscription activated handling

[menvil]

Summary

• CONV-251: Added failing tests for handleSubscriptionActivated
• CONV-252: Implemented subscription activation — updates user.plan via forceFill using plan from BillingPlanRepository
• Unknown plan key throws UnknownBillingPlanException
• FeatureAccessService will see updated plan immediately via user.plan

Test plan

• free → pro plan update on activation
• free → max plan update on activation
• Unknown plan key throws exception
• composer test passes (455 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements subscription activation handling to update user.plan based on the billing plan key. Addresses CONV-251/CONV-252 by wiring handleSubscriptionActivated to the plan repository and covering it with tests.

• New Features
  • handleSubscriptionActivated uses the plan repository to set user.plan (free → pro or free → max).
  • Throws UnknownBillingPlanException for invalid keys; tests cover success and error paths.

^{Written for commit e8dc13c. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-251-test-subscription-activated-updates-user-plan

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