feat(parsing): LaTeX, Nougat, GROBID parsers with chunking

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

codex/config.py

@@ -9,7 +9,7 @@ from __future__ import annotations
 
 from functools import lru_cache
 
-from pydantic import Field
+from pydantic import AliasChoices, Field
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
@@ -42,6 +42,12 @@ class Settings(BaseSettings):
         description="Base URL of the GROBID HTTP API (containerised).",
     )
 
+    nougat_url: str = Field(
+        default="http://localhost:8080",
+        validation_alias=AliasChoices("NOUGAT_URL", "nougat_url"),
+        description="Base URL of the Nougat OCR HTTP API (containerised).",
+    )
+
     ollama_base_url: str = Field(
         default="http://localhost:11434",
         description="Base URL of the local Ollama endpoint (optional Q&A layer).",