fix(macos): avoid 255 section-per-segment limit

[aimir]

On macOS, each defmt log statement created a unique section in the .defmt segment. With 200+ logs, this exceeded Mach-O's 255 section limit.

Fix: Group logs by severity level instead of unique hash per log.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/macos-255-section-limit

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