feat(misc): add rate limiting and retry patterns notebook

Production-grade retry and rate-limit management for the Anthropic API:
exponential backoff with jitter via tenacity, token budget tracking with
proactive sleep at 80% quota, rate-limit header inspection via
with_raw_response, async semaphore-based batch processing. Includes a
ProductionAPIClient that composes all four layers.

Built by Rudrendu Paul, developed with Claude Code

Author: RudrenduPaul