Add retry helper with exponential backoff

[drewjsttestlema]

Standardize transient-error handling across the examples with a small retry.Do helper that retries an operation with exponential backoff — doubling the wait after each failure.

Why exponential over a fixed interval: a fixed retry interval hammers a struggling dependency at a constant rate; backoff sheds load as failures persist. Rejected pulling in a third-party retry library to keep the example dependency-free.

[github-actions]

lema verify

Description check: 4 of 4 stated changes found

✅ 4 changes found

• a small retry.Do helper — retry/retry.go
• that retries an operation with exponential backoff — retry/retry.go
• doubling the wait after each failure — retry/retry.go
• Rejected pulling in a third-party retry library to keep the example dependency-free — retry/retry.go

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Important

This PR settles: Transient error retry policy for examples — The project will use a custom retry.Do helper with exponential backoff for handling transient errors in examples. This approach doubles the wait after each failure.

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_{Checked against: description · lema verify v1 · this repo: 1 / 50 free checks this month}