erlang_wasm 0.4.1

0.4.1

Documentation only; no code change beyond one module doc.

• Every figure in README.md and docs/ now cites a run in
  test/audit/PERF.md. Nineteen were stale, mixed two runs, or had no
  measurement at all: the specification gate (65,481 assertions over 256
  suites), the WASI syscall count (45), the tier's per-guest numbers, the cost
  of accepting a request, and the compile and instantiate costs of the
  committed fixtures.
• The CPython guide quotes the current reactor numbers: 88 ms a request, and
  91 to 95 s for a capturing start_link/2.