Close local release-quality gaps and reconcile workplan status

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a0e332-3365-77c0-8491-084e9ea33ac1

llm_connect/toml_config.py

@@ -18,7 +18,6 @@ Resolution order (highest → lowest):
 import os
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Optional
 
 import toml
 
@@ -55,8 +54,8 @@ def _dir_config_name(app_name: str) -> str:
 @dataclass
 class LLMLayer:
     """One layer of provider/model configuration (may be partial)."""
-    provider: Optional[str] = None
-    model: Optional[str] = None
+    provider: str | None = None
+    model: str | None = None
 
 
 @dataclass
@@ -129,7 +128,7 @@ def _clear_llm_section(path: Path, section: str) -> bool:
 
 # ── Directory config path helper ─────────────────────────────────────────
 
-def _dir_config_path(app_name: str = "markitect") -> Optional[Path]:
+def _dir_config_path(app_name: str = "markitect") -> Path | None:
     root = find_project_root()
     if root is None:
         return None
@@ -139,8 +138,8 @@ def _dir_config_path(app_name: str = "markitect") -> Optional[Path]:
 # ── Resolution ───────────────────────────────────────────────────────────
 
 def resolve_llm(
-    cli_provider: Optional[str] = None,
-    cli_model: Optional[str] = None,
+    cli_provider: str | None = None,
+    cli_model: str | None = None,
     app_name: str = "markitect",
 ) -> ResolvedLLM:
     """Walk the 7-level priority chain and return a fully resolved config.