Deferred deeper-audit P1. validateDoorTarget only string-checked the
host; a bare fetch did its own DNS resolution, so a hostname could
resolve to 127.0.0.1/169.254.169.254 between check and connect. The
executor now resolves once (dns.lookup all), rejects if ANY resolved
address is blocked (isBlockedDoorIp: loopback/unspecified/link-local/
metadata incl IPv4-mapped IPv6; RFC1918/LAN/ULA allowed since door
controllers live there), then connects to the validated IP literal so
fetch performs no second resolution (TOCTOU closed). Original Host kept
best-effort; redirect:'manual' retained. Dependency-free (no undici
seam). 33 door-logic tests; suite 532.
Moheeb Zara
42fd3859a4