add .gitignore, clean up generated files from node_modules

Remove from tracking:
- dist/ (build output, regenerated by bun run build.ts)
- node_modules/.pnpm/ (pnpm internal store, 247MB)
- node_modules/.bin/ (executable symlinks)
- node_modules/.ignored/ and .ignored_* (source-map dirs moved aside by pnpm)
- 100 pnpm-installed package symlinks (regenerated by pnpm install)

Keep in tracking:
- Private package stubs not on npm (color-diff-napi, modifiers-napi,
  @ant/claude-for-chrome-mcp, @anthropic-ai/mcpb, @anthropic-ai/sandbox-runtime)
- Source-map extracted packages not installed by pnpm (@grpc/*, @protobufjs/*, etc.)

claude-code-source/node_modules/@inquirer/input/dist/esm/index.mjs

@@ -1,68 +0,0 @@
-import { createPrompt, useState, useKeypress, usePrefix, isEnterKey, isBackspaceKey, makeTheme, } from '@inquirer/core';
-export default createPrompt((config, done) => {
-    const { required, validate = () => true } = config;
-    const theme = makeTheme(config.theme);
-    const [status, setStatus] = useState('idle');
-    const [defaultValue = '', setDefaultValue] = useState(config.default);
-    const [errorMsg, setError] = useState();
-    const [value, setValue] = useState('');
-    const prefix = usePrefix({ status, theme });
-    useKeypress(async (key, rl) => {
-        // Ignore keypress while our prompt is doing other processing.
-        if (status !== 'idle') {
-            return;
-        }
-        if (isEnterKey(key)) {
-            const answer = value || defaultValue;
-            setStatus('loading');
-            const isValid = required && !answer ? 'You must provide a value' : await validate(answer);
-            if (isValid === true) {
-                setValue(answer);
-                setStatus('done');
-                done(answer);
-            }
-            else {
-                // Reset the readline line value to the previous value. On line event, the value
-                // get cleared, forcing the user to re-enter the value instead of fixing it.
-                rl.write(value);
-                setError(isValid || 'You must provide a valid value');
-                setStatus('idle');
-            }
-        }
-        else if (isBackspaceKey(key) && !value) {
-            setDefaultValue(undefined);
-        }
-        else if (key.name === 'tab' && !value) {
-            setDefaultValue(undefined);
-            rl.clearLine(0); // Remove the tab character.
-            rl.write(defaultValue);
-            setValue(defaultValue);
-        }
-        else {
-            setValue(rl.line);
-            setError(undefined);
-        }
-    });
-    const message = theme.style.message(config.message, status);
-    let formattedValue = value;
-    if (typeof config.transformer === 'function') {
-        formattedValue = config.transformer(value, { isFinal: status === 'done' });
-    }
-    else if (status === 'done') {
-        formattedValue = theme.style.answer(value);
-    }
-    let defaultStr;
-    if (defaultValue && status !== 'done' && !value) {
-        defaultStr = theme.style.defaultAnswer(defaultValue);
-    }
-    let error = '';
-    if (errorMsg) {
-        error = theme.style.error(errorMsg);
-    }
-    return [
-        [prefix, message, defaultStr, formattedValue]
-            .filter((v) => v !== undefined)
-            .join(' '),
-        error,
-    ];
-});