* fix(slack): normalize react emoji glyphs and clarify member-info userId param
Slack's reactions.add/remove only accept shortcode names, never a raw
Unicode glyph, but the react action's emoji param had no description
steering models away from passing one, so calls like
emoji="✅" failed with invalid_name. Consolidates the glyph-to-shortcode
map that already existed privately in the ack-reaction dispatch path into
the shared normalizeSlackEmojiName export in actions.ts, the layer that
owns the actual Slack API calls, so the message-tool react action gets the
same normalization.
Also tightens the generic userId param description so models stop trying
target on member-info, which has no target mode and requires userId
directly.
* fix(slack): preserve emoji reaction semantics
* fix(slack): default reactions to inbound message
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Co-authored-by: Peter Steinberger <steipete@gmail.com>
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