chore: upgrade typescript from ^4 to ^5#51
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TypeScript 5 is a straightforward major bump with no breaking changes affecting this codebase. All compilation, tests, and linting pass cleanly. https://claude.ai/code/session_01HNvBcQzT1SviRqkUpP5Xce
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Summary
typescriptfrom^4.6.3to^5typescriptfrom dry-aged-deps exclusionsRisk: 2/5
TypeScript 5 introduced no breaking changes that affect this codebase. Compilation, all tests (100% coverage), eslint, and spellcheck all pass cleanly. The only note is a ts-jest warning about TS 5.x not being in its tested range — but all tests pass and this will be resolved when jest is upgraded later.
Test plan
tsc --buildcompiles without errorshttps://claude.ai/code/session_01HNvBcQzT1SviRqkUpP5Xce