Slack hosted conversation parity

[mohammedahmed18]

Summary

• add hosted Slack conversation kinds for public/private channels, DMs, and group DMs
• add hosted users discovery/rendering support without exposing email/private fields
• harden portable checkpoint compatibility and provider authority validation for non-public conversations

Verification

• cargo +1.96.0 test -p locality-slack --lib
• cargo +1.96.0 test -p locality-protocol --test slack_scope
• cargo +1.96.0 fmt -p locality-slack -p locality-protocol -p locality-auth-core --check
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
locality	Ready	Preview	Aug 20, 2026 2:02pm