Document list_events before_event_id anchor

[devin-ai-integration]

Summary

Keeps the published skill in sync with invisible-tools/dawn#5785, which adds before_event_id to list_events. Without this, an agent following the skill reads a long conversation from turn 1 to reach an anchor near the end — the pattern that made a customer's dataset export take ~3 hours.

Documents the anchored form in raindrop-investigate (tool reference table + the middle-tier bullet in the investigation loop):

list_events({ convo_id, before_event_id, limit: 20 })  // preceding 20 turns, newest first, one call

Also notes the constraint that isn't inferable from the parameter list: anchored reads require a concrete project, since the anchor lookup resolves a project-salted event ID and rejects *.

Docs only — no tool definitions or code.

Link to Devin session: https://app.devin.ai/sessions/d806c82a5912461da4fbe54f5bf94944
Requested by: @ManavShahWasTaken

[devin-ai-integration]

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