docs: move fix history into changelog

[CoreyLeath-code]

Summary

Moves the complete Recent Code Improvements table from the README into a dated changelog entry. No table wording, cell values, or Markdown row formatting was rewritten.

Files changed

File	Why
CHANGELOG.md	New canonical, dated location for the original fix-history table under ## 2026-08-05.
README.md	Removes the table completely and points readers to the changelog, preventing the README from becoming a historical change log.

Validation performed

• Extracted the table directly from README.md and inserted it without modifying its content.
• Confirmed CHANGELOG.md did not previously exist.
• CI is triggered on this PR; this change does not alter source, dependencies, build configuration, or runtime behavior.

Risks

• Documentation-only move. The only user-facing navigation change is the new relative link to CHANGELOG.md.

Follow-up recommendations

• Add future user-visible fix history to CHANGELOG.md rather than duplicating it in the README.

Summary by CodeRabbit

• Documentation
  • Added a dated changelog covering recent package, authentication, model loading, backend, database, and testing improvements.
  • Updated the README to direct readers to the changelog for detailed fix history.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5681e572-3643-4254-b380-34ff8553624e

📥 Commits

Reviewing files that changed from the base of the PR and between 3e1a234 and 60c3fb2.

📒 Files selected for processing (2)

• CHANGELOG.md
• README.md

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📝 Walkthrough

Walkthrough

The changelog now records the 2026-08-05 improvements. The README replaces its inline fix table with a link to CHANGELOG.md.

Changes

Documentation history

Layer / File(s)	Summary
Dated improvement history and README reference CHANGELOG.md, README.md	CHANGELOG.md adds the dated improvement table. README.md links to the changelog instead of embedding the fix table.

Estimated code review effort: 1 (Trivial) | ~3 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/changelog-fix-history

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