feat(types): federation v1 wire-format DTOs (FED-M3-01)

Add packages/types/src/federation/ with Zod v4 schemas and inferred TS
types for the M3 federation wire protocol. Includes verbs constant,
request schema, list/get/capabilities response factories, _source tag
helper, and typed error envelope + exception hierarchy. 46 unit tests;
typecheck, lint, and format:check all green.

Closes #462

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/types/package.json

@@ -26,7 +26,8 @@
   },
   "dependencies": {
     "class-transformer": "^0.5.1",
-    "class-validator": "^0.15.1"
+    "class-validator": "^0.15.1",
+    "zod": "^4.3.6"
   },
   "publishConfig": {
     "registry": "https://git.mosaicstack.dev/api/packages/mosaicstack/npm/",