Anchored Metadata operations

Anchored Metadata operation reference from the canonical Document API contract.

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Attach a JSON payload to a span of text and read it back across DOCX round-trips. Backed by hidden inline content controls and namespaced Custom XML Data Storage Parts; consumers see one operation set.

Operation	Member path	Mutates	Idempotency	Tracked	Dry run
metadata.attach	metadata.attach	Yes	non-idempotent	No	Yes
metadata.list	metadata.list	No	idempotent	No	No
metadata.get	metadata.get	No	idempotent	No	No
metadata.update	metadata.update	Yes	idempotent	No	Yes
metadata.remove	metadata.remove	Yes	non-idempotent	No	Yes
metadata.resolve	metadata.resolve	No	idempotent	No	No