X_DECLARED_KEY_UNREAD
Means
a leaf key of a declaration surface — the type a primitive or a define* factory takes — is read by nothing in packages/*/src
Typical cause
the same defect X_CONFIG_KEY_UNREAD catches on AppConfig, one surface over, where no rule existed. Measured: packages/render/src/route.ts declared budget.css, budget.cls and budget.tbt, registerRoute flattens a budget to budgetJs + budgetLcp, and every reader downstream reads only those two — so budget: { cls: 0.1 } was ignored in silence while x verify's own budgets step reported green. A ratchet, and a pin whose reason is blank is a finding too
Fix
delete the key from its declaration, or wire it and prove the read; to keep it deliberately, add it to DECLARATION_READER_PINS in scripts/declaration-readers.ts with the sentence naming who reads it