Docs-only appendix per ADR-0011 (never a shipped artifact). The three
mandatory ALB attribute overrides (idle_timeout=4000,
client_keep_alive=604800, preserve_host_header=true) with the telephony
reasons; the never-NLB-TLS rule with the 350s-silent-drop + no-HTTP-
context rationale; 100-target-group fleet ceiling; per-node EIPs for
direct media UDP; copy-paste aws elbv2 CLI path to first call.
Signed-off-by: Aaron D. Lee <himself@adlee.work>
