feat: refactor node spec and add mcp tools (#244)

* refactor: carve out extraction panel

* refactor: create spec versions for node types

* refactor: create a GenericNode and remove custom nodes

* feat: add python and typescript sdk

* add dograh sdk

* fix: fetch draft workflow definition over published one

* fix: fix routes of SDKs to use code gen

* chore: remove doclink dependency to reduce image size

* chore: format files

* chore: bump pipecat

* feat: let mcp fetch archived workflows on demand

* chore: fix tests

* feat: add sdk documentation

* chore: change banner and add badge

sdk/python/src/dograh_sdk/errors.py

@@ -0,0 +1,32 @@
+"""SDK-level exceptions.
+
+All errors raised from `dograh_sdk` are subclasses of `DograhSdkError` so
+calling code can catch them as one category.
+"""
+
+
+class DograhSdkError(Exception):
+    """Base class for all SDK errors."""
+
+
+class ValidationError(DograhSdkError):
+    """Raised when node data fails client-side validation (unknown field,
+    missing required field, obvious type mismatch).
+
+    Server-side Pydantic validation runs on save and may raise further
+    errors via `ApiError` — this class covers the fast-fail cases caught
+    at the `Workflow.add()` call site.
+    """
+
+
+class ApiError(DograhSdkError):
+    """Raised when the Dograh backend returns a non-2xx response."""
+
+    def __init__(self, status_code: int, message: str, body: object = None):
+        super().__init__(f"[{status_code}] {message}")
+        self.status_code = status_code
+        self.body = body
+
+
+class SpecMismatchError(DograhSdkError):
+    """Raised when a referenced node type isn't registered on the server."""