refactor: rename API and frontend projects to Vocero

Rename the project directories, Python distribution and import package, and npm package. Update launcher, Docker, tooling, tests, lockfiles, and documentation while preserving existing API contracts.

Make AGENTS.md self-contained and remove external skill and workflow references.

vocero-api/vocero_api/api/responses.py

@@ -0,0 +1,18 @@
+"""Validate service-owned response structure without rewriting the wire body."""
+
+from typing import Any
+
+from fastapi.responses import JSONResponse
+from pydantic import BaseModel
+
+
+def validated_json_response(
+    content: Any,
+    model: type[BaseModel],
+    *,
+    status_code: int = 200,
+) -> JSONResponse:
+    model.model_validate(content)
+    # model_dump would insert defaults, potentially coerce values, and reorder
+    # fields. Keeping the original JSONResponse serialization is intentional.
+    return JSONResponse(content=content, status_code=status_code)