[codex] fix Polar provider edge cases

[lassejlv]

Summary

• Include normalized subscription data in successful Polar checkout webhooks so PayKit checkout completion can finalize subscriptions.
• Re-link duplicate Polar customers using HTTP validation errors, exact email lookup, and Polar external IDs while preserving metadata.
• Mark PayKit-managed Polar products and only archive tagged orphan products during sync.
• Add focused mocked unit tests for Polar provider config, checkout webhooks, customer relinking, and product cleanup.

Validation

• node ./node_modules/vitest/vitest.mjs run packages/polar/src/tests/polar-provider.test.ts --config vitest.unit.config.ts
• bun --filter @paykitjs/polar typecheck
• bunx oxlint packages/polar --deny-warnings
• bunx oxfmt --check packages/polar/src/polar-provider.ts packages/polar/src/tests/polar-provider.test.ts
• bun --filter @paykitjs/polar build

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
paykit	Skipped		May 6, 2026 8:22pm

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