docs: prepare v0.0.122 documentation

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Release target

This cumulative draft prepares documentation for v0.0.122.
It covers merged changes after v0.0.121 through the reviewed main commit recorded as a parent of the latest workflow-created commit.
The workflow selects v0.0.122 by incrementing the patch component of v0.0.121.

Managed state

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Follow Post-Merge Documentation Catch-Up for development, recovery, validation, and release-cutoff routing.

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• An independent documentation writer approved each exact cumulative patch.
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