docs: update 0.2.0-beta.1 changelog

[PenguinDOOM]

Summary

• Expand the 0.2.0-beta.1 changelog from the initial rendering-mode-only draft.
• Include the merged rendering mode and stencil features, compatibility defaults, validation coverage, and repository/release maintenance since 0.1.0.
• Update the changelog date to 2026/08/11.

Scope

Only CHANGELOG is changed.

[codacy-production]

Up to standards ✅

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[codacy-production]

Pull Request Overview

This PR updates the 0.2.0-beta.1 changelog to include detailed information on rendering modes, stencil support, compatibility defaults, and validation coverage. It also includes maintenance details such as LF enforcement and workflow dependencies. Codacy analysis indicates the PR is up to standards, and no functional or documentation issues were identified.

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[Copilot]

Pull request overview

Expands the 0.2.0-beta.1 changelog entry in Pure-Base to capture additional features and validation work since 0.1.0, and updates the entry’s date.

Changes:

• Expanded the 0.2.0-beta.1 bullet list to include stencil support, compatibility defaults, and validation coverage.
• Updated the changelog date for the 0.2.0-beta.1 entry.

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