[zimeg]

Summary

This pull request adds a method example for admin.conversations.bulkSetProperties.

• methods/src/admin/conversations/admin_conversations_bulk_set_properties.py calls client.admin_conversations_bulkSetProperties with the reference page's arguments: channel_ids and the exclude_from_slack_ai property example.
• The folder mirrors agents/conversations/ (.slack/ config, manifest.json, and __init__.py files), and methods/README.md lists the method. Socket Mode stays off, like the other plain Web API families (blocks/, canvases/, chat/).
• The manifest asks for the admin.conversations:write user scope on an org-level install, since this method needs an org admin's user token.

Dependency: stays a draft

This depends on slackapi/python-slack-sdk#1991, which adds admin_conversations_bulkSetProperties to slack_sdk. The methods type check fails against the currently pinned slack_sdk==3.46.0 until that ships in a release. This PR stays a draft until then, and the slack_sdk pin gets bumped to that release here.

Testing

With slackapi/python-slack-sdk#1991 installed locally:

1. cd methods/src/admin/conversations && slack install --environment local on an Enterprise org, then export SLACK_TOKEN=xoxp-... with an org-level user token that has admin.conversations:write.
2. Replace C0123456789 with a test channel ID.
3. slack run admin_conversations_bulk_set_properties.py and confirm ok with a bulk_action_id and an empty not_updated.
4. Call conversations.info on the channel and confirm channel.properties includes "exclude_from_slack_ai": true.

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