docs: Create CHANGELOG.md with Keep a Changelog format

[Xhristin3]

Problem Statement

No changelog exists. Users and contributors have no visibility into what changed between versions.

Evidence

CHANGELOG.md does not exist.

Impact

No release notes. Users cannot understand what changed. Contributors' work is invisible. Package versions (all at 1.0.0) have no documented history.

Proposed Solution

Create CHANGELOG.md following Keep a Changelog format. Backfill from git history using Conventional Commit messages. Group entries by: Added, Changed, Deprecated, Removed, Fixed, Security.

Acceptance Criteria

• CHANGELOG.md follows Keep a Changelog format
• Includes all releases back to 1.0.0
• Entries grouped by change type
• Links to git tags

File Map

• CHANGELOG.md — new

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Labels: documentation, good first issue
Priority: Medium | Difficulty: Beginner | Estimated Effort: 1h

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Labels: documentation,good first issue
Priority: Medium | Difficulty: Beginner | Estimated Effort: 1h
Backlog ID: REPO-030

[shadrach68]

Hi, I am confident that I can resolve this issue as soon as possible if assigned to me because I have the technical expertise to resolve it.

[grantfox-oss]

🦊 GrantFox — @shadrach68 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #213)
2. Your PR will be reviewed by the XStreamRollz maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@shadrach68's PR #287 was approved and merged by @Xhristin3.

🏆 @shadrach68: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (398 total points). Track your full progress on GrantFox.

👏 Great work, @shadrach68! Keep contributing to XStreamRollz.