docs: OTAFIX 2.3-BP1.6 changelog entry

[jamesarich]

Changelog for the BP1.6 release: the #34 CURRENT.UF2 sizing fix (with the re-take-your-backups note) and the #29 tinyusb bump. Tag 0.9.2-OTAFIX2.3-BP1.6 to follow once this lands.

Summary by CodeRabbit

• Bug Fixes

  • Fixed backup sizing after serial or Bluetooth OTA updates, preventing truncated dumps.
  • Restoring newly created backups now boots correctly and preserves data integrity.
  • Existing backups created with BP1.5 or earlier should be retaken after a DFU update.

• Documentation

  • Added release notes for OTAFIX 2.3-BP1.6, including backup and USB flashing validation details.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: f07124fa-9a4f-4e36-85b4-8b1235467bc2

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Reviewing files that changed from the base of the PR and between 33e095d and 1378971.

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• changelog.md

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📝 Walkthrough

Walkthrough

The changelog adds the OTAFIX 2.3-BP1.6 entry. It documents corrected CURRENT.UF2 sizing, backup guidance, RAK4631 verification, and the lib/tinyusb digest update.

Changes

OTAFIX 2.3-BP1.6 changelog

Layer / File(s)	Summary
Document UF2 and TinyUSB updates changelog.md	Adds the release entry with UF2 sizing behavior, backup guidance, serial DFU verification, and TinyUSB hardware validation details.

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

Merge Risk: ⚪ Minimal · up to 13789

This change only adds the BP1.6 changelog entry and introduces no actionable merge-blocking risk; it is merge-ready after normal checks and review.

Poem

A rabbit reads the changelog bright,
UF2 tails now fit just right.
TinyUSB hops through every test,
RAK4631 proves the rest.
Fresh backups thump their feet—
OTAFIX makes the record neat.

🚥 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 and concisely describes the added OTAFIX 2.3-BP1.6 changelog entry.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
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.

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