Add critical-path figures with captions, ASCII topology sketches,
labeled teaching-code vs code.py snippets, and details collapses for
optional depth. Recompress official PNGs; keep essay spine visible.
Co-authored-by: Xinlu Lai <CrazyBoyM@users.noreply.github.com>
Pull Anthropic essay PNGs (primitives, dynamic-vs-static, six patterns,
quarantine triage) into images/, wire them into EN/ZH/JA with captions,
and add a short untrusted-input beat. Drop substitute SVGs for those four.
Co-authored-by: Xinlu Lai <CrazyBoyM@users.noreply.github.com>
