T opens the tech tree — every tech grouped by era in era order, cost chips in
item colours, era prefix stripped from node names (the heading already says
it), UNLOCKS: tooltips in machine names not ids. Pick a node to dispatch
setResearch; picking the active one stands it down; ratified nodes are inert.
The v4 gating rule lives in a pure research.ts: an id any tech claims is locked
until that tech completes, and an id no tech mentions is always available — so
belts never padlock. Locked machines are greyed with a padlock and a
REQUIRES: <TECH> tooltip, and can't be picked by click or by hotkey. The
padlock falls off in the same frame `researched` lands, and the player never
keeps holding something they can no longer build.
With no ResearchState at all the safe reading is that gates hold rather than
fall open, and the panel says RESEARCH OFFLINE instead of rendering a tree that
can't do anything.
Accent precedence now matches RENDER exactly: MachineDef.accent, then the
first-output derivation, then the codex kind table. RESEARCH joins the page
order for the new 'lab' kind.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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