SemanticIndex | Add deterministic IndexStoreDB cleanup on shutdown#2503

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sean7218:sean7218/indexStoreDB-closing-api

Commits on Feb 27, 2026

Refactor UncheckedIndex to use ThreadSafeBox for IndexStoreDB management
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Implement close() method in MainFilesProvider and ensure index store closure in BuildServerManager shutdown
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Commits on Feb 28, 2026

Add ToolchainRegistry and IndexStoreDB integration in TaskSchedulerTests
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