Follow-up to the salvaged #113591 gate:
- Teams writes the bot's conversation identity as `28:<app id>` (activity.recipient.id,
mention entities) while App.id is the bare app id. The mention match and the own-message
filter now accept both spellings, so a real tenant mention no longer fails silently.
- A payload that mentions only other people is no longer treated as a bot mention; the
`<at>` text fallback applies only when the activity carries no mention entities at all.
- `self._extra` holds `platforms.teams.extra` on the instance so keys read after
construction (require_mention today) are not dropped with a constructor local (#114366).
- Reply exemption uses one bounded deque instead of deque + mirror set.
- Tests trimmed to two invariants: gate table (drop before attachment download / keep
mention, reply-to-bot, personal) and env-over-YAML precedence. TEAMS_REQUIRE_MENTION
documented in plugin.yaml and the Teams docs page.
Co-authored-by: Kevin Rajan <7121943+kvnloo@users.noreply.github.com>
Co-authored-by: finn763 <165816600+finn763@users.noreply.github.com>
Co-authored-by: Fernando Muñoz Suazo <fernandrewm@gmail.com>
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