(J) Prototype pollution guard (CodeRabbit major).
`--set __proto__.x=1` previously mutated Object.prototype because
`overrides.__proto__` returned Object.prototype on a plain object,
and assigning `[key]=value` polluted every plain object in the process.
Verified the attack reproduces on
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| .. | ||
| docs | ||
| installer | ||
| build-docs.mjs | ||
| fix-doc-links.js | ||
| format-workflow-md.js | ||
| javascript-conventions.md | ||
| migrate-custom-module-paths.js | ||
| skill-validator.md | ||
| validate-doc-links.js | ||
| validate-file-refs.js | ||
| validate-skills.js | ||
| validate-svg-changes.sh | ||