Clarify Settlement modes (#177)

* rename

* rename settlement modes: PRIVATE / BATCH_HASHED / INDIVIDUAL_FULL

Names now describe both settlement strategy and data visibility,
making the enum self-documenting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs

* update docs and tutorials to use new settlement mode names

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* format

* gitignore

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Co-authored-by: balogh.adam@icloud.com <adambalogh@mac.mynetworksettings.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people