UN-3034 [FIX] Add retry backoff configuration for LLMWhisperer client

[gaya3-zipstack]

What

• Add configurable retry backoff parameters for the LLMWhisperer v2 client to handle transient HTTP errors (429, 5xx)
• Increment LLMWhisperer client version in sdk1

Why

• LLMWhisperer API calls can fail due to transient HTTP errors (rate limiting 429, server errors 5xx)
• Without retry logic, these transient failures cause document extraction to fail unnecessarily
• Configurable backoff allows tuning retry behavior per deployment environment

How

• Added three new environment variables: ADAPTER_LLMW_MAX_RETRIES, ADAPTER_LLMW_RETRY_MIN_WAIT, ADAPTER_LLMW_RETRY_MAX_WAIT
• Added corresponding constants in WhispererEnv and WhispererDefaults
• Pass retry parameters (max_retries, retry_min_wait, retry_max_wait) to LLMWhispererClientV2 constructor
• Updated sample.env files for both backend and prompt-service
• Incremented LLMWhisperer client version in sdk1

Can this PR break any existing features. If yes, please list possible items. If no, please explain why. (PS: Admins do not merge the PR without this section filled)

• No. The retry parameters have sensible defaults (3 retries, 1s min wait, 60s max wait) that match previous behavior. Existing deployments without these env vars will use the defaults.

Database Migrations

• None

Env Config

• ADAPTER_LLMW_MAX_RETRIES (default: 3) - Max retry attempts for transient HTTP errors. Set 0 to disable.
• ADAPTER_LLMW_RETRY_MIN_WAIT (default: 1.0) - Min backoff wait in seconds between retries
• ADAPTER_LLMW_RETRY_MAX_WAIT (default: 60.0) - Max backoff wait in seconds between retries

Relevant Docs

Related Issues or PRs

• UN-3034

Dependencies Versions

• Updated llmwhisperer-client version in sdk1

Notes on Testing

• Verified retry parameters are correctly passed to the LLMWhisperer client constructor
• Tested with default env values and custom overrides for extraction

Screenshots

Checklist

I have read and understood the Contribution Guidelines.

[sonarqubecloud]

Quality Gate failed

Failed conditions
12 Security Hotspots
D Reliability Rating on New Code (required ≥ A)

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