Symptom: pre-login banner on ttyS0 (Minicom 2.9 VT102) rendered as
trailing `�` after every emoji line. The console driver couldn't
decode the UTF-8 multi-byte sequences for ⚡🔐🌐📡 and emitted the
replacement character instead.
The `█` box-block characters (U+2588) DO render correctly in VT102+
UTF-8 — they're a single-byte-class glyph in most modern fonts. We
keep those so the SECUBOX wordmart still looks like SecuBox.
Replacements (compatible with VT102 minicom AND SSH UTF-8 alike):
⚡ -> >>
🔐 -> [user]
🌐 -> [web]
📡 -> [ssh]
The /etc/motd block (shown after SSH login) is left untouched — SSH
sessions have proper UTF-8 terminals so the rich emojis are fine
there.
Also add scripts/build-kernel-local.sh (new): the local kernel build
script that I authored today for #255. Documented; runs the same
defconfig + merge_config + scripts/config + olddefconfig + sed ZRAM
override + bindeb-pkg flow as .github/workflows/build-kernel.yml,
without the 20-min GitHub Actions ping-pong.
Co-authored-by: CyberMind-FR <gandalf@Gk2.net>
