perf(build): strip standalone comments

[Chemaclass]

Summary

• strip source comments from the assembled standalone binary with the Bash-aware shfmt parser
• preserve the shebang, # src/... boundary markers, and all heredoc content
• install the pinned build optimizer in build and npm-publish CI
• enforce a 500 KiB ceiling for the generated executable

Size

• before: 612,341 bytes
• after: 479,022 bytes
• reduction: 133,319 bytes (21.8%)

The source tree remains fully documented; only the release artifact is optimized.

Verification

• env -u NO_COLOR ./build.sh --verify — 1,655 tests and 2,478 assertions
• make sa
• make lint
• pinned shfmt v3.13.1 installation from the workflow command