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/msal-node/dist/cache/distributed/DistributedCachePlugin.mjs

@@ -1,49 +0,0 @@
-/*! @azure/msal-node v3.8.1 2025-10-29 */
-'use strict';
-import { AccountEntity } from '@azure/msal-common/node';
-
-/*
- * Copyright (c) Microsoft Corporation. All rights reserved.
- * Licensed under the MIT License.
- */
-/**
- * Cache plugin that serializes data to the cache and deserializes data from the cache
- * @public
- */
-class DistributedCachePlugin {
-    constructor(client, partitionManager) {
-        this.client = client;
-        this.partitionManager = partitionManager;
-    }
-    /**
-     * Deserializes the cache before accessing it
-     * @param cacheContext - TokenCacheContext
-     */
-    async beforeCacheAccess(cacheContext) {
-        const partitionKey = await this.partitionManager.getKey();
-        const cacheData = await this.client.get(partitionKey);
-        cacheContext.tokenCache.deserialize(cacheData);
-    }
-    /**
-     * Serializes the cache after accessing it
-     * @param cacheContext - TokenCacheContext
-     */
-    async afterCacheAccess(cacheContext) {
-        if (cacheContext.cacheHasChanged) {
-            const kvStore = cacheContext.tokenCache.getKVStore();
-            const accountEntities = Object.values(kvStore).filter((value) => AccountEntity.isAccountEntity(value));
-            let partitionKey;
-            if (accountEntities.length > 0) {
-                const accountEntity = accountEntities[0];
-                partitionKey = await this.partitionManager.extractKey(accountEntity);
-            }
-            else {
-                partitionKey = await this.partitionManager.getKey();
-            }
-            await this.client.set(partitionKey, cacheContext.tokenCache.serialize());
-        }
-    }
-}
-
-export { DistributedCachePlugin };
-//# sourceMappingURL=DistributedCachePlugin.mjs.map