refactor(common): consolidate XML parsing (Commit 2.7)

- Create common/src/util/xml/ directory for organized modules
- Move saxy.ts to xml/saxy.ts (streaming XML parser)
- Create xml/tag-utils.ts (closeXml, getStopSequences)
- Create xml/tool-call-parser.ts (parseToolCallXml)
- Add unified xml/index.ts re-exports
- Add explicit package.json export for @codebuff/common/util/xml
- Update consumers to use new import path

Author: brandonkachen

common/package.json

@@ -5,6 +5,18 @@
   "private": true,
   "type": "module",
   "exports": {
+    "./analytics": {
+      "bun": "./src/analytics/index.ts",
+      "import": "./src/analytics/index.ts",
+      "types": "./src/analytics/index.ts",
+      "default": "./src/analytics/index.ts"
+    },
+    "./util/xml": {
+      "bun": "./src/util/xml/index.ts",
+      "import": "./src/util/xml/index.ts",
+      "types": "./src/util/xml/index.ts",
+      "default": "./src/util/xml/index.ts"
+    },
     "./*": {
       "bun": "./src/*.ts",
       "import": "./src/*.ts",

common/src/util/__tests__/saxy.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'bun:test'
 
-import { Saxy } from '../saxy'
+import { Saxy } from '../xml'
 
 describe('Saxy XML Parser', () => {
   // Helper function to process XML and get events

common/src/util/xml/index.ts

@@ -0,0 +1,17 @@
+export {
+  Saxy,
+  parseAttrs,
+  type TextNode,
+  type CDATANode,
+  type CommentNode,
+  type ProcessingInstructionNode,
+  type TagOpenNode,
+  type TagCloseNode,
+  type NextFunction,
+  type SaxyEvents,
+  type SaxyEventNames,
+  type SaxyEventArgs,
+  type TagSchema,
+} from './saxy'
+export { parseToolCallXml } from './tool-call-parser'
+export { closeXml, getStopSequences } from './tag-utils'