Send greeting when user joins via invite

[saulmc]

Summary

• After accepting an invite join request in the onInvite handler, send a greeting message to the conversation
• This gives users an immediate welcome when they scan a QR code and join an agent's conversation (the "Launch Agent" flow)
• Matches the existing behavior of the "Join and Launch" flow which already sends a greeting

Test plan

• Launch an agent via pool manager "Launch Agent"
• Scan the QR code to join
• Verify the greeting message appears in the conversation

🤖 Generated with Claude Code

[macroscopeapp]

Send a greeting through the reply pipeline when a user joins via invite in /convos/join and convosPlugin.startAccount

Adds channel.triggerGreeting to route a synthetic InboundMessage through handleInboundMessage, calls it after successful joins in /convos/join, and triggers it once per conversation on the first auto-accepted invite in convosPlugin.startAccount. Minor ID parsing is reformatted.

📍Where to Start

Start with convosPlugin.startAccount and the new triggerGreeting in channel.ts, then review the /convos/join handler in index.ts.

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Macroscope summarized 24b9397.