Brings in the TUI package and the hardening review (createProgram in
program.ts, qqq doctor, the golden-output suite). Resolutions: main.ts
from the base; program.ts prints versionText(), whose second line now
starts with "UI API client <version>" as the golden test expects and
adds the supported server range; the CLI package keeps the release
metadata with the base's exports and its new conformance dependency,
and conformance goes to 1.6.0-rc.2 because the CLI now ships against it.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>