feat(encrypt):reduce encrypted temp-write metadata overhead by caching(url) temp-root readiness and turning the temp-file path into TTL fast path + NotFound fallback + AlreadyExists cleanup .

[baojun-zhang]

Description

Reduce metadata overhead for encrypted temp writes by caching temp-root readiness and using a fast-path temp-file write flow with targeted fallback handling.

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

• Added a TTL-based temp-root readiness cache in EncryptionWrappedFS to avoid repeatedly preparing the encrypted temp root on every write.
• Split deterministic temp path handling into encrypted_temp_root() and encrypted_temp_path(), and changed encrypted temp writes to use a fast path first.
• Added fallback handling for NotFound and stale AlreadyExists temp files, plus cache pruning logic and regression coverage for stale temp replacement and temp-path mapping.

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes