chore(deps): upgrade vitest monorepo 4.0.18 → 4.1.5

[dtoxvanilla1991]

Summary

Clean replacement for #129 (which has merge conflicts against the current main).

Upgrades vitest and @vitest/coverage-v8 from 4.0.18 → 4.1.5 - a minor version bump.
No migration required. All 51 tests pass.

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Is this a breaking change?

No. This is a 4.0.x → 4.1.x minor bump. All 4.1.x changes are additive or deprecation-only. Nothing was removed in this series. The deprecations emit runtime warnings but do not break existing code. This codebase uses none of the deprecated APIs anyway (verified by code scan).

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Key changes across the 4.1.x series

Security

• 4.1.2: Bumps flatted dependency to resolve its CVE (security advisory #9975)

New features (4.1.0)

• aroundEach / aroundAll lifecycle hooks
• mockThrow / mockThrowOnce mock helpers
• Tags support for tests (test.tag)
• Enhanced retry options for flaky tests
• New agent reporter (reduces AI agent token usage)
• Chai-style assertions
• --detect-async-leaks CLI flag

Deprecations (backward-compatible warnings only)

• toBe* spy aliases → prefer toHaveBeen* (not used in this codebase)
• Several vitest/* sub-entry points (not used in this codebase)

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Changes

• package.json: specifiers bumped ^4.0.18/^4.0.0 → ^4.1.5
• pnpm-lock.yaml: lockfile updated — vitest and @vitest/coverage-v8 resolve to 4.1.5

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Supersedes: #129

[coderabbitai]

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/upgrade/vitest-4.1.5

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