fix(cli): remove F-09 spillover from F-12 branch, keep only wiki group

cli.py and config.py were accidentally contaminated with uncommitted F-09
changes (search_app restructure, rich ingest, mathpix/figures settings).
This restores both files to main-baseline + F-12-only additions:
- cli.py: wiki_app group (compile/list/check), restore @app.command search
- config.py: wiki_dir, wiki_llm_model, wiki_llm_url, wiki_top_k only

All 127 tests green, ruff+mypy clean.

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

codex/config.py

@@ -84,41 +84,6 @@ class Settings(BaseSettings):
         ),
     )
 
-    # ------------------------------------------------------------------
-    # F-09 Rich Parsing — MathPix + pix2tex + figures
-    # ------------------------------------------------------------------
-    mathpix_app_id: str | None = Field(
-        default=None,
-        description=(
-            "MathPix application ID for the MathPix API "
-            "(env var: MATHPIX_APP_ID). Optional — pix2tex is used as fallback."
-        ),
-    )
-
-    mathpix_app_key: str | None = Field(
-        default=None,
-        description=(
-            "MathPix application key for the MathPix API "
-            "(env var: MATHPIX_APP_KEY). Optional — pix2tex is used as fallback."
-        ),
-    )
-
-    pix2tex_fallback: bool = Field(
-        default=True,
-        description=(
-            "Enable pix2tex LatexOCR as the local fallback for formula extraction "
-            "when MathPix credentials are not set. Disable only for testing."
-        ),
-    )
-
-    figures_dir: str = Field(
-        default="figures/",
-        description=(
-            "Directory where extracted figure images (PNG) are written. "
-            "Relative paths are resolved from the current working directory."
-        ),
-    )
-
     # ------------------------------------------------------------------
     # F-12 Wiki-Compile
     # ------------------------------------------------------------------