Wires the new ADDITIONAL_CONTEXT_URL feature on the central webhook service
(see gitea_admin/pragent e8ebc54) — fetches a static maintainer-curated brief
from the Nexus raw-hosted repo at review time. The doc distils the house
rules so the agent doesn't have to re-derive them from the diff each PR:
* chat messages are immutable after send (counts baked into buttons freeze)
* translatable components + singular-form rule for pt-BR sentences
* Geyser/Bedrock can't click — every click has a typed fallback
* vanilla stats only — <world>/players/stats/<uuid>.json, NOT <world>/stats
* reactions keep counting late (reacao-validade-minutos)
* Floodgate is optional runtime, never compile-time
Plus the canonical focus/instructions/languages config: java, balanced style,
claude-sonnet-5 cost target, JDK 25 build note.
Co-Authored-By: Claude <noreply@anthropic.com>