#202 Fix: [for cherry-picking] Added a dedicated Date constructor capability

Fixed Findings

• Track Date core constructor capability separately

Automated fix from agentic review of https://github.com/metaphorics/bamTiScript/pull/201

Summary by Sourcery

Separate the ES2015 Date constructor capability from the broader ES2015 library to preserve accurate Date typings under scoped library configurations.

Bug Fixes:

• Track the ES2015 Date constructor capability independently so Date(value) receives the correct parameter types when only the core library is enabled.

Enhancements:

• Extend library target and name resolution to include the dedicated ES2015 Date core capability.

Tests:

• Add coverage for Date constructor typing with the ES5 and ES2015 core libraries enabled.

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Summary by cubic

Tracks the ES2015 Date constructor capability separately from the broader ES2015 library so Date(value) gets correct parameter types when only the core library is enabled.