test(conversations): the agent loop reproduces the true conversations end to end (phase 4 item 5)

[leemour]

Task

Storage phase 4, item 5 (plan): prove that batches, answers and a build reproduce known conversations exactly.

What

• src/conversations/agent-loop.test.ts builds an invented chat of 400 messages with known parents: each message answers one of the 40 before it, or starts a conversation, and a tenth of the answers are the messenger's own replies.
• A scripted agent answers every batch from the known parents, through the service: build, batches next, links add, then build again.
• The stored conversations must equal the known grouping exactly.
• I used an invented chat instead of the plan's IRC gold links: the proof is the same, it needs no download, and it runs in CI. The plan's item 5 says so.
• The IRC dev-split run with a real agent stays by hand.

Testing

The test passes in about a second; lint and typecheck pass.

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