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This resolves issue #573 by moving uwf's CAS directory from ~/.uncaged/workflow/cas/ to the shared ~/.uncaged/json-cas/ location. Changes: - Added getGlobalCasDir() function with UNCAGED_CAS_DIR support - Updated createUwfStore() to use global CAS directory - Added comprehensive test coverage (11 new tests) - Updated all existing tests for environment isolation - Updated documentation (CLAUDE.md, README.md) Benefits: - Cross-tool visibility: json-cas CLI can read uwf-created nodes - Schema sharing: both tools access same schema registry - Future-proofing: enables json-cas render/verbose for uwf data Fixes #573 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>