docs(root): register guide_themes.md in Documentation and Subsystem tables

Readme.md

@@ -80,6 +80,7 @@ The **MMA (Multi-Model Agent)** system decomposes epics into tracks, tracks into
 | [Simulations](./docs/guide_simulations.md) | `live_gui` fixture, Puppeteer pattern, mock provider, visual verification, test areas by subsystem, headless service |
 | [Context Curation](./docs/guide_context_curation.md) | AST masking, fuzzy anchor slices, structural file editor, view presets, history snapshotting |
 | [Shaders & Window](./docs/guide_shaders_and_window.md) | Hybrid shader injection, custom window frame, NERV theme effects |
+| [Themes](./docs/guide_themes.md) | TOML-based theming, `[colors]` table, 4-syntax-palette upstream limit, `load_themes_from_disk` / `apply_syntax_palette` API, color-callable convention |
 | [Meta-Boundary](./docs/guide_meta_boundary.md) | Application vs Meta-Tooling domains, inter-domain bridges, cross-tool abstractions |
 
 ---
@@ -104,6 +105,7 @@ The **MMA (Multi-Model Agent)** system decomposes epics into tracks, tracks into
 | Test infrastructure & simulations | [Simulations](./docs/guide_simulations.md) | `tests/conftest.py`, `simulation/` |
 | Headless service (FastAPI) | [Simulations](./docs/guide_simulations.md#headless-service-tests) | `src/api_hooks.py` |
 | NERV theme & visual effects | [Shaders & Window](./docs/guide_shaders_and_window.md#4-nerv-theme-effects) | `src/theme_nerv.py`, `src/theme_nerv_fx.py` |
+| TOML theme system (palette + syntax) | [Themes](./docs/guide_themes.md) | `src/theme_2.py`, `src/theme_models.py` |
 | Custom window frame | [Shaders & Window](./docs/guide_shaders_and_window.md#2-custom-window-frame-strategy) | `src/gui_2.py` |
 | Workspace profiles (docking layouts) | *Dedicated guide pending* | `src/workspace_manager.py` |
 | History (undo/redo) | [Context Curation](./docs/guide_context_curation.md#context-snapshotting-per-take) | `src/history.py` |