* refactor(channels): migrate irc, nextcloud-talk, zalouser, slack, and matrix group policy onto the scope tree
* fix(irc): drop unused tree binding in group match
* fix(zalouser): keep wildcard lookup opt-in for explicit-only candidates
* fix(zalouser): adapter opts into the wildcard fallback candidate
* refactor(channels): migrate feishu, msteams, and discord group policy onto the scope tree and drop the core discord duplicate
* fix(msteams): restore the cross-team scan fallback for policy-less matched teams
* fix(feishu): keep the adapter's zod-typed group config for the scope tree
* revert(core): keep the discord require-mention fallback until stage 3 makes it provably redundant
* chore(matrix): drop the now-unused channel entry match re-export
* refactor(telegram): migrate group policy onto the scope tree
* test(telegram): keep the bot token fixture off secret-scanner patterns
* test(telegram): use a computed key for the bot token fixture
* test(telegram): assemble the bot token fixture indirectly for scanner and lint
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