fix: revert ignoreDeprecations to "5.0" to fix TS5103 in CI

[mikib0]

Summary

• Reverts ignoreDeprecations in tsconfig.json from "6.0" back to "5.0"

Root Cause

The checks CI job was failing with TS5103: Invalid value for '--ignoreDeprecations'. CI installs TypeScript 5.9.3 (pinned in bun.lock), and that version rejects "6.0" as a valid value for ignoreDeprecations — only TypeScript 6.x accepts it.

The "6.0" value was added to silence the baseUrl deprecation warning (TS5101), but that warning only appears in TypeScript 6.x. Since CI runs 5.9.3, the fix was unnecessary and broke the build.

Test plan

• bun check-types passes in CI (no TS5103 error)
• Biome and other checks continue to pass

https://claude.ai/code/session_01SypcK5vavfiCGcM8BPtTmY

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