chore: bump version to 5.43.0

[full-bars]

Promotes the [Unreleased] CHANGELOG section to 5.43.0 and adds the rotation/TDS detection fix (#617) that was missing from it.

Test plan

• ruff check (E9,F63,F7,F82,F401)
• pytest -q (572 passed; unrelated pre-existing scripts/test_vad_s3.py error)

Summary by CodeRabbit

• Bug Fixes
  • Improved radar rotation and TDS detection when display data is unavailable for a scan.
  • Detection now continues across all volumes, while only unavailable visual frames are omitted.
  • Preserved rotation results even when no displayable moment exists.

[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: b178c66e-2ed1-4eeb-9480-c363677dc915

📥 Commits

Reviewing files that changed from the base of the PR and between d41b1d9 and 1f4a00b.

📒 Files selected for processing (1)

• CHANGELOG.md

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📝 Walkthrough

Walkthrough

The changelog now identifies version 5.43.0, dated 2026-07-28, and documents that rotation/TDS detection and sidecar serialization continue when display-moment caches are unavailable.

Changes

Release notes

Layer / File(s)	Summary
Document release and detection fix CHANGELOG.md	Replaces the “Unreleased” marker with the 5.43.0 release header and records the radar detection behavior correction.

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 matches the version bump and release promotion, though it omits the rotation/TDS fix details.
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 release/v5.43.0

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