⬆️ migrate to TypeScript 6.0

[ianardee]

Description

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires a change to the official Guide documentation.

[Copilot]

Copilot review overview

🟢 Approval recommended

All reviewed changes are consistent and no unresolved issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Migrates the project to TypeScript 6.0 and removes the deprecated baseUrl compiler option.

Changes:

• Upgrades TypeScript to 6.0.3.
• Refreshes lockfile dependencies, including tsx.
• Retains path aliases while removing baseUrl.

File	Description
tsconfig.json	Removes obsolete baseUrl configuration.
package.json	Upgrades TypeScript.
package-lock.json	Locks updated TypeScript and dependency versions.

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[Copilot]

Copilot review overview

🟡 Changes recommended

Wire tsconfig.test.json into relevant scripts or remove it.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 1

Open (1)

• Test tsconfig is unused, so CI does not type-check tests · New

[Copilot]

Copilot review overview

🟢 Approval recommended

All reviewed changes are covered with no unresolved blocking issues.

Review effort: Lite
Findings: None

Resolved since last review (1)

• Test tsconfig is unused, so CI does not type-check tests