* msteams: fetch thread history via Graph API for channel replies
* msteams: address PR #51643 review feedback
- Wrap resolveTeamGroupId Graph call in try/catch, fall back to raw
conversationTeamId when Team.ReadBasic.All permission is missing
- Remove dead fetchChatMessages function (exported but never called)
- Add JSDoc documenting oldest-50-replies Graph API limitation
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* msteams: address thread history PR review comments
* msteams: only cache team group IDs on successful Graph lookup
Avoid caching raw conversationTeamId as a Graph team GUID when the
/teams/{id} lookup fails — the raw ID may be a Bot Framework conversation
key, not a valid GUID, causing silent thread-history failures for the
entire cache TTL.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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