docs(changelog): add v3.0.3, v3.1.0, v3.1.1 entries

[louzt]

Summary

The CHANGELOG.md was last updated for v2.1.0 (2025-11-10) and missed the
entire v3.x release line. After PR #11 dropped docs/WHATS_NEW_V2.{1,2}.md,
CHANGELOG.md became the sole release-notes surface — and it was already
6 months stale. This PR backfills the v3.x entries.

Changes

Version	Date	Section	Source
3.1.1	2026-07-28	docs-only PATCH (drop WHATS_NEW_V2 dupes; binary remains 3.1.0)	v3.1.1 release notes disclaimer
3.1.0	2026-07-04	NSIS bundler fix, netboozt-service removal, clippy cleanup	v3.1.0 release notes
3.0.3	2026-03-27	Performance & Build Improvements (MSI + NSIS)	v3.0.3 release notes

Why this PR

• CHANGELOG.md declares itself as canonical per Keep-a-Changelog format.
• GitHub Releases is a complementary surface (per-release binary download),
  not a replacement for the Keep-a-Changelog format tooling consumes.
• Without this backfill, the docs cleanup in PR chore(docs): drop WHATS_NEW_V2.{1,2}.md (CHANGELOG dupes) #11 would have removed the
  only available notes for the entire v3.x release line.

Out of scope

• No code changes. No version bump. No new release.
• The Windows installer binary remains functionally identical to v3.1.0;
  Cargo.toml was not touched (same pattern as the v3.1.1 PATCH release).

Verification

• git diff --stat main...docs/changelog-v3-backfill → 1 file changed, 32 insertions
• CHANGELOG.md still follows Keep-a-Changelog format
• No formatting / lint CI run needed (markdown only)

Summary by CodeRabbit

• Documentation
  • Added release notes for version 3.1.1.
  • Clarified that this is a documentation-only release with no installer or functional changes.
  • Removed duplicated release note content.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 252c97f0-388b-42d9-8cbd-3a03daa486e5

📥 Commits

Reviewing files that changed from the base of the PR and between 00ed2a3 and c6c796e.

📒 Files selected for processing (1)

• CHANGELOG.md

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📝 Walkthrough

Walkthrough

The changelog adds a dated v3.1.1 entry for a documentation-only patch. It records the removed duplicate documentation file and unchanged installer behavior and version metadata. Existing v3.1.0, v3.0.3, and installer notes remain below it.

Changes

Changelog update

Layer / File(s)	Summary
Release note history CHANGELOG.md	The changelog adds the v3.1.1 release entry and restores the existing v3.1.0, v3.0.3, and installer notes.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the changelog entries added by this pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/changelog-v3-backfill

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