* feat(mattermost): add thread.requireExplicitMention to opt out of thread auto-follow
Mattermost treats any reply in a thread the bot has participated in as an
implicit mention, so requireMention only gates the first message and the bot
then answers follow-ups addressed to other people for the participation TTL.
Slack exposes channels.slack.thread.requireExplicitMention for exactly this;
Mattermost had no equivalent and its strict schema rejected the key.
Add channels.mattermost.thread.requireExplicitMention (channel + per-account),
mirroring Slack. When set, thread participation no longer counts as a mention.
Default (unset/false) keeps today's auto-follow behavior unchanged.
Related: #108269
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* feat(channels): add implicit mention policy foundation
* feat(channels): unify implicit mention policy
Co-authored-by: leon <dodoma0919@gmail.com>
* refactor(channels): keep implicit policy inside evaluator
* fix(channels): use exported implicit mention type
* chore(channels): satisfy extension lint
* fix(config): break implicit mention type cycle
* fix(plugin-sdk): account for implicit mention config export
* refactor(config): isolate implicit mention schema
* chore(plugin-sdk): align implicit mention surface budget
* fix(config): remove unused schema re-export
---------
Co-authored-by: leon <dodoma0919@gmail.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
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