Architecture / Approach

Pre-JB (now)

Mac/Pi4 → VPS doc server → Kindle Experimental Browser
  │                              │
  └─ static HTML/TXT docs        └─ manual navigation, read-only

Post-JB (after SpringBreak)

Pi4 agent
  ├── telnet → Kindle (poll: awake? doc open?)
  ├── nc/scp → push docs, trigger KOReader
  └── schedule: check for new docs every N minutes

Kindle PW5
  ├── telnetd (scriptlet)
  ├── KOReader (scriptlet-installed)
  ├── ads disabled (scriptlet)
  └── OTA permanently blocked (KUAL extension)