docs(ci): add doc-object pipeline reference doc

[jdcmsd]

this is part of the testing process!

Proposed Changes

• Adds docs/core/DOC_OBJECT_PIPELINE.md — reference documentation for the doc-object pipeline: what it generates, how to fetch notes locally, the schema summary, audience filtering, and provenance tracking

Checklist

• Tests — N/A (documentation only)

[github-actions]

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