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b5ae536a-3762-4f1c-a7fe-5a0f18fd2219.1

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Haixing-Hu 
Enhance cargo caching strategy for faster CI builds

- Upgrade to v2 cache strategy with Cargo.lock checksums for precise invalidation
- Add granular cargo cache paths (registry/index, registry/cache, git/db, target)
- Implement cross-job cache sharing to eliminate redundant downloads
- Add workspace sharing between build_and_test and doc jobs
- Update all jobs to use enhanced caching strategy consistently

Cache Key Structure:
  v2-cargo-cache-{{ arch }}-{{ checksum "Cargo.toml" }}-{{ checksum "Cargo.lock" }}

Benefits:
  * Eliminate redundant dependency downloads across jobs
  * Reduce clippy execution time from 10s to near-zero on cache hit
  * Enable doc job to reuse build artifacts (saves 10-20s)
  * More precise cache invalidation (only when dependencies actually change)
  * Consistent caching across all pipeline jobs

Performance Impact:
  - Dependency compile time: 10s → ~1-2s (cache hit)
  - Cache efficiency: Improved with Cargo.lock precision
  - Cross-job cache reuse: All jobs share same cargo cache

Documentation:
  - Add OPTIMIZATION_NOTES.md explaining all optimizations
  - Document known limitations (Docker image downloads)
  - Provide guidance for future improvements
  - Include performance metrics and recommendations

Note: Docker image download time (12-16s per job) remains due to CircleCI
architecture limitations. This is acceptable for free-tier and can be
eliminated with Docker Layer Caching (DLC) on paid plans if needed.

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