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/@aws-sdk/region-config-resolver/dist-cjs/index.js

@@ -1,49 +0,0 @@
-'use strict';
-
-var configResolver = require('@smithy/config-resolver');
-var stsRegionDefaultResolver = require('./regionConfig/stsRegionDefaultResolver');
-
-const getAwsRegionExtensionConfiguration = (runtimeConfig) => {
-    return {
-        setRegion(region) {
-            runtimeConfig.region = region;
-        },
-        region() {
-            return runtimeConfig.region;
-        },
-    };
-};
-const resolveAwsRegionExtensionConfiguration = (awsRegionExtensionConfiguration) => {
-    return {
-        region: awsRegionExtensionConfiguration.region(),
-    };
-};
-
-Object.defineProperty(exports, "NODE_REGION_CONFIG_FILE_OPTIONS", {
-    enumerable: true,
-    get: function () { return configResolver.NODE_REGION_CONFIG_FILE_OPTIONS; }
-});
-Object.defineProperty(exports, "NODE_REGION_CONFIG_OPTIONS", {
-    enumerable: true,
-    get: function () { return configResolver.NODE_REGION_CONFIG_OPTIONS; }
-});
-Object.defineProperty(exports, "REGION_ENV_NAME", {
-    enumerable: true,
-    get: function () { return configResolver.REGION_ENV_NAME; }
-});
-Object.defineProperty(exports, "REGION_INI_NAME", {
-    enumerable: true,
-    get: function () { return configResolver.REGION_INI_NAME; }
-});
-Object.defineProperty(exports, "resolveRegionConfig", {
-    enumerable: true,
-    get: function () { return configResolver.resolveRegionConfig; }
-});
-exports.getAwsRegionExtensionConfiguration = getAwsRegionExtensionConfiguration;
-exports.resolveAwsRegionExtensionConfiguration = resolveAwsRegionExtensionConfiguration;
-Object.keys(stsRegionDefaultResolver).forEach(function (k) {
-    if (k !== 'default' && !Object.prototype.hasOwnProperty.call(exports, k)) Object.defineProperty(exports, k, {
-        enumerable: true,
-        get: function () { return stsRegionDefaultResolver[k]; }
-    });
-});

claude-code-source/node_modules/@aws-sdk/region-config-resolver/dist-cjs/regionConfig/stsRegionDefaultResolver.js

@@ -1,20 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.warning = void 0;
-exports.stsRegionDefaultResolver = stsRegionDefaultResolver;
-const config_resolver_1 = require("@smithy/config-resolver");
-const node_config_provider_1 = require("@smithy/node-config-provider");
-function stsRegionDefaultResolver(loaderConfig = {}) {
-    return (0, node_config_provider_1.loadConfig)({
-        ...config_resolver_1.NODE_REGION_CONFIG_OPTIONS,
-        async default() {
-            if (!exports.warning.silence) {
-                console.warn("@aws-sdk - WARN - default STS region of us-east-1 used. See @aws-sdk/credential-providers README and set a region explicitly.");
-            }
-            return "us-east-1";
-        },
-    }, { ...config_resolver_1.NODE_REGION_CONFIG_FILE_OPTIONS, ...loaderConfig });
-}
-exports.warning = {
-    silence: false,
-};