Revert "Release 0.1.5"

[AyushBherwani1998]

Reverts #91

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Note

Low Risk
Low risk because this only reverts release metadata (changelog/version) and a trivial config formatting change, with no runtime logic impact.

Overview
Reverts the 0.1.5 release bookkeeping by removing its CHANGELOG.md entry and updating the [Unreleased] compare link to start from v0.1.4.

Also bumps package.json version back from 0.1.5 to 0.1.4, and makes a no-op whitespace cleanup in vitest.config.mts.

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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Changelog 0.1.0 section has broken heading structure

Medium Severity

The revert corrupted the ## [0.1.0] changelog section. The original ### Added subsection was split into ### Uncategorized (line 53) and a new ## Added (line 57). The ## Added is a level-2 heading, making it appear as a top-level version section rather than a subsection of [0.1.0]. This orphans the starter template entries from the [0.1.0] release and introduces a non-standard Uncategorized category, breaking the Keep a Changelog format.