docs: set 16 GB minimum supported RAM

bible-local/architecture/runtime-flows.md

@@ -143,7 +143,7 @@ Build host notes:
 - The live-build workdir under `dist/` is disposable; source files under `iso/builder/` stay clean.
 - Container build requires `--privileged` because `live-build` uses mounts/chroots/loop devices during ISO assembly.
 - On macOS / Docker Desktop, the builder still must run as `linux/amd64` so the shipped ISO binaries remain `amd64`.
-- Operators must provision enough RAM to hold the full compressed live medium plus normal runtime overhead, because `toram` copies the entire read-only ISO payload into memory before the system reaches steady state.
+- Supported systems have at least 16 GB of installed RAM. This provides room for the full compressed live medium plus normal runtime overhead because `toram` copies the entire read-only ISO payload into memory before the system reaches steady state. A mid-copy failure must not be classified as low RAM without direct `ENOSPC`, OOM, or tmpfs-limit evidence.
 
 ## Post-boot smoke test
 

bible-local/architecture/system-overview.md

@@ -91,7 +91,7 @@ Fills gaps where Redfish/logpile is blind:
 - Live-ISO-only responsibilities stay in `iso/` integration code
 - Live ISO launches the Go CLI with `--runtime livecd`
 - Local/manual runs use `--runtime auto` or `--runtime local`
-- Live ISO targets must have enough RAM for the full compressed live medium plus runtime working set because the boot medium is copied into memory at startup
+- Live ISO targets have a supported minimum of 16 GB installed RAM, enough for the full compressed live medium plus runtime working set; mid-copy failures require direct evidence before being classified as memory exhaustion
 
 ## Key paths