Fix adapted cache deserialization recovery

[Fryuni]

Summary

• validate freshly loaded values before they can enter cached-value recovery
• evict malformed cached values and retry once through the normal cache miss path
• cover direct loads, background revalidation, and shared in-flight requests

Verification

• npx jest -c jest.config.js test/adapted.test.ts --runInBand (15 passed)
• npx eslint src/adapted.ts test/adapted.test.ts
• npm run validate
• end-to-end malformed JSON cache smoke scenario

[github-actions]

👋 @Fryuni

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