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/@azure/logger/dist/esm/index.js

@@ -1,40 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT License.
-import { createLoggerContext } from "@typespec/ts-http-runtime/internal/logger";
-const context = createLoggerContext({
-    logLevelEnvVarName: "AZURE_LOG_LEVEL",
-    namespace: "azure",
-});
-/**
- * The AzureLogger provides a mechanism for overriding where logs are output to.
- * By default, logs are sent to stderr.
- * Override the `log` method to redirect logs to another location.
- */
-export const AzureLogger = context.logger;
-/**
- * Immediately enables logging at the specified log level. If no level is specified, logging is disabled.
- * @param level - The log level to enable for logging.
- * Options from most verbose to least verbose are:
- * - verbose
- * - info
- * - warning
- * - error
- */
-export function setLogLevel(level) {
-    context.setLogLevel(level);
-}
-/**
- * Retrieves the currently specified log level.
- */
-export function getLogLevel() {
-    return context.getLogLevel();
-}
-/**
- * Creates a logger for use by the Azure SDKs that inherits from `AzureLogger`.
- * @param namespace - The name of the SDK package.
- * @hidden
- */
-export function createClientLogger(namespace) {
-    return context.createClientLogger(namespace);
-}
-//# sourceMappingURL=index.js.map