v0.4.0 — code blocks in user messages

First public release.

Added

• Fence matcher for user messages: renders ``` and ~~~ blocks the same
  way as code in an assistant reply
• Theme-aware syntax highlighting for python, js/ts, json, bash, go, rust, java,
  html/xml, sql and css. Colors come from the existing --shiki-token-*
  variables, so light and dark palettes switch automatically
• Language banner and a copy button in the block header
• Monochrome mode for terminal transcripts: text, txt, plain, output,
  log, console, terminal, diff, patch, markdown, md
• Built-in type and constant-name coloring, plus CSS property names
• A separate HTML/XML tag parser, so <div class="x"> is not read as operators
• 40 tests and a CI matrix on Node 20/22/24 (Ubuntu and macOS)

Notes

• An unclosed fence is never rendered as a block, and single backticks stay
  untouched
• No runtime dependencies and no build step: the browser half is a hand-written
  plain-JS module