fix: resolve ESM/CJS conflict by renaming silent-npx.js to silent-npx.cjs

[scrossle]

Fixes #20

Issue

The silent-npx.js file uses CommonJS require() syntax, but since package.json declares "type": "module", Node.js treats all .js files as ES modules. This causes the error:

ReferenceError: require is not defined in ES module scope

All hooks fail because they all go through the silent-npx.js wrapper:

• SessionStart
• • PreToolUse
• • UserPromptSubmit
• • Stop

Solution

• Rename hooks/silent-npx.js → hooks/silent-npx.cjs
• • Update all references in hooks/hooks.json
    The .cjs extension forces Node.js to parse the file as CommonJS, regardless of the "type": "module" setting in package.json.

[scrossle]

Superseded by #22 which uses a PseudoConsole (ConPTY) approach instead of the simple npx wrapper fix.