Strips adapter module, defaultCommand, listModels, configurationDoc,
capabilityMatrix, and notes fields from the ConnectorDefinition type.
What remains is the declarative pi-mono shape: id, provider, label,
description, defaultModel, auth descriptor, onboardingFeatured, notes.
The three data files are imported and spread into the CONNECTORS array.
findConnectorDefinition + listFeaturedOnboardingConnectors stay in the
lookup module unchanged. Docs builders still provide buildOAuthDoc /
buildApiKeyDoc / buildCloudDoc for the Settings panel and are consumed
by connectors.ts when synthesising per-row configuration docs.
ConnectorAuth now uses `type` as the discriminator (legacy `kind` alias
removed — credential-resolver and ipc-credentials-handlers already keyed
off `type`).
