Fix bulk update_tags tag IDs to type string (follow-up to #554)

[kilian-tennyson]

Why?

In the public API, tag IDs are strings — the tag schema documents id as type: string (example '123456'), and every content id in POST /content/bulk_actions is a quoted string. PR #554 documented the update_tags action's add_tag_ids / remove_tag_ids as type: integer with unquoted examples, which is inconsistent with the rest of the API and produces integer-typed array fields in generated SDKs. The endpoint accepts both string and integer ids, so this is a documentation-consistency fix with no runtime change.

How?

Types add_tag_ids / remove_tag_ids items as string and quotes their examples, in both the content_bulk_action_request schema and the update_tags request example.

• Document update_tags bulk action on /content/bulk_actions #554

_{Generated with Claude Code}