feat: DH-22113: MCP sessions#316

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bmingles wants to merge 27 commits intomainfrom

DH-21947_mcp-sessions

Commits on Mar 18, 2026

DH-21947_mcp-data-tool-fixes/task-01: Install @deephaven/jsapi-utils npm package as a production dependency to enable ConnectionUtils.fetchVariableDefinition method
bmingles
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DH-21947_mcp-data-tool-fixes/task-02: Replace hardcoded 'Table' type in getTableOrError() with ConnectionUtils.fetchVariableDefinition from @deephaven/jsapi-utils. Current implementation at line 17…
bmingles
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DH-21947_mcp-data-tool-fixes/task-03: Update unit tests in tableUtils.spec.ts to verify rollup table support. Current tests only mock basic Table objects. Add test cases that: 1) Mock a rollup tabl…
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DH-21947_mcp-data-tool-fixes/task-04: Verify MCP data tools work with rollup tables. Three MCP tools use getTableOrError: getTableData.ts (line 104), getTableStats.ts (line 81), getColumnStats.ts (…
bmingles
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Fixed type errors affecting unit tests (#DH-21947)
bmingles
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use fetchVariableDefinitionByPredicate (#DH-21947)
bmingles
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Updated jsapi-utils version (#DH-21947)
bmingles
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cleaned up tests (#DH-21947)
bmingles
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Fixed tests (#DH-21947)
bmingles
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Simplified tests (#DH-21947)
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Test cleanup (#DH-21947)
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Commits on Mar 19, 2026