Add offline cache support with SCITOKENS_KEYCACHE_FILE environment variable and enhanced scitokens-keycache tool#172

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Copilot wants to merge 6 commits intomasterfrom

copilot/fix-0f9970ca-a064-4896-97de-366c8e0afa85

Commits on Aug 13, 2025

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Copilot
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Add offline support with SCITOKENS_KEYCACHE_FILE and scitokens-keycache tool

Copilot
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djw8605
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Add comprehensive tests and documentation for offline cache functionality

Copilot
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djw8605
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Commits on Aug 14, 2025