v0.4.0

• feat: copydeck export script now includes links to demo/code, ID and "reviewed?" fields

• feat: make the library Pyodide-first (for now)
  Refocus the demo and copydeck on what real Pyodide (pinned 0.26.2 /
  CPython 3.12) actually produces.

  Demo:

  • Run real Pyodide live in the browser instead of replaying hand-authored
    traces: each snippet is executed and its actual traceback is explained
  • Pin the Pyodide version in one place (docs/pyodide-config.js) and show
    it in the demo header
  • Add npm run regen:traces (scripts/regenerate-demo-traces.mjs) to cache
    real traces into docs/demo-examples.js, so the coverage test asserts
    against genuine Pyodide output

  Copydeck:

  • Match "assignment used instead of comparison" on the code pattern rather
    than a CPython message string, so it survives wording changes between
    versions
  • Drop the "incomplete input" SyntaxError variant: real Pyodide never emits
    that message (it's REPL / pre-3.10 only), so it isn't reachable here

  Behaviour:

  • friendlyExplain now returns null when there is no friendly mapping (or the
    error can't be parsed) instead of a generic "Python error" fallback, so
    callers fall back to the raw Python/Pyodide error. Removes the "Other"
    copydeck entry and the fallback UI strings.

  BREAKING CHANGE: friendlyExplain returns ExplainResult | null; callers must
  handle null rather than always receiving a result.

• feat: add release script (for managing npm publishing and GH releases)

Full Changelog: v0.3.0...v0.4.0