alexocode / babel / d3ad6608739f7fc2bdbfb0dcd509509cd5746578

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✨ Add private context to Babel.Context

Add `private` field to `Babel.Context` for passing metadata through
pipelines without affecting the transformed data itself.

Changes:
- Add `private` field to Context (map, default %{})
- Update Context.new/3 to accept optional private parameter
- Thread private through Pipeline.apply/2 execution
- Support steps returning {:ok, data, private} tuple
- Accept both maps and keyword lists for private values
- Normalize {:ok, data, private} to {:ok, data} in Trace.result/1
- Private is merged across steps (later values overwrite earlier)
- Fully backward compatible with {:ok, data}

Test coverage: 11 new tests, all passing (217 total tests green)

12 of 12 new or added lines in 3 files covered. (100.0%)

455 of 458 relevant lines covered (99.34%)

395.67 hits per line