* docs(discord): document channel-allowlist and ambient room event pitfalls
Three gating behaviors that silently produce a mute or blind agent:
- A guild channels map is an allowlist. Adding one entry denies every
unlisted channel rather than leaving them at guild defaults; the "*"
wildcard key keeps the rest of the guild reachable.
- requireMention: true drops unmentioned messages before they can become
room events, so an ambient agent has no room backlog at all.
- Room events post via message(action=send), but the message tool ships
only in the messaging profile; a coding-profile agent listens and can
never speak.
Adds matching Discord failure-signature rows to channel troubleshooting.
* docs: regenerate docs map for new Discord and ambient headings
2cf6b50614