* fix(runtime): gate node:sqlite on a NUL round-trip capability probe
Validate the loaded SQLite library and TEXT, BLOB, and JSON round trips across startup, doctor, Gateway install, update preflight, and installers. Admit capable Node 24+ vendor builds with a support-policy note while retaining the package engines and Node 22 exclusion. Refs #140465#140672.
* fix(runtime): expose capability diagnostics through doctor
Register the runtime check in the ordered Doctor contribution catalog. Keep shared audit types in a leaf module, include the bootstrap probe in duplicate scanning, and update native runtime and compiled-worker fixtures for the capability protocol.
* fix(update): preserve target Node version requirements
* fix(install): remove unused Node major probe state
