New tier-0 doctor tool: one-pass environment preflight with a remedy for every failing check.
- Vendor toolchains: tizen/sdb and ares-* presence + versions
- Signing: classifies each Tizen certificate profile — Samsung-issued (installs on real TVs) vs the generic SDK distributor cert (emulator only, real panels reject it)
- Devices: TCP reachability per configured TV with platform-specific remediation (dev-mode/Host-PC-IP for Tizen, 50h Dev Mode expiry for webOS)
- webOS passphrase env vars and stored pairing tokens
Validated against a live environment: correctly identified the exact generic-cert and unreachable-TV failures from the original hardware test session.