chore: update CHANGELOG.md for v0.11.0

[striderZA]

Adds CHANGELOG entry for v0.11.0 release (SFML 3 & Raylib engine reference docs).

Cleans up stale 'unreleased' stubs and adds proper versioned section.

[github-actions]

Review: chore: update CHANGELOG.md for v0.11.0

Summary

Good cleanup — removes 5 stale duplicate "unreleased" stubs (+21/-60) and replaces them with a proper v0.11.0 section. Content and formatting are accurate.

Issues

Severity	Issue
Minor	Release date says 2026-07-22 but PR is created on 2026-07-23. The date should reflect the actual release date.

All entries (SFML 3 & Raylib docs, Pi compatibility fixes, dependency bumps) correctly match the referenced issues (#78, #85, #84, #83, #75, #74).

Suggestions

1. Date: Change [v0.11.0] — 2026-07-22 to [v0.11.0] — 2026-07-23 if releasing today.
2. Unreleased header: Consider adding a ## [Unreleased] section at the top (above v0.11.0) as a template for future entries — this is the Keep a Changelog convention.
3. Trailing whitespace: Lines 122-124 in the resulting file have 3 trailing blank lines; could clean down to 1.

Otherwise, this is a clean changelog update with no bugs.

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