feat: publish HoloLake model-native living system source

product-source/hololake-platform/docs/adr/0013-remove-theming-system.md

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+---
+type: ADR
+id: "0013"
+title: "Remove vault-based theming system"
+status: superseded
+date: 2026-03-23
+superseded_by: "0081"
+---
+
+## Context
+
+Laputa had a vault-based theming system where themes were markdown notes in `theme/` with `type: Theme` frontmatter. Each property became a CSS variable. This included a `ThemeManager` hook, theme property editor, dark mode detection, live preview on save, and three built-in themes. The system was complex (spanning Rust seed/create/defaults modules, TypeScript hooks, and CSS variable bridging) and added significant maintenance burden for a feature that most users never customized beyond the defaults.
+
+## Decision
+
+**Remove the vault-based theming system entirely. The app uses a single, hardcoded light theme defined in CSS variables (`src/index.css`) and editor theme (`src/theme.json`).** The `theme/` folder, `ThemeManager` hook, theme Rust modules, theme property editor, and dark mode support were all deleted.
+
+## Options considered
+
+- **Option A** (chosen): Remove theming, ship a single polished light theme — drastically reduced complexity, fewer files to maintain, no theme-related bugs. Downside: no user customization, no dark mode.
+- **Option B**: Keep theming but simplify — reduce to light/dark toggle only. Downside: still requires theme loading, CSS variable bridging, and live preview infrastructure.
+- **Option C**: Keep the full theming system — maximum flexibility. Downside: high maintenance cost for a rarely-used feature, frequent source of bugs (WKWebView reflow issues, CSS var sync).
+
+## Consequences
+
+- Deleted: `src-tauri/src/theme/`, `src/hooks/useThemeManager.ts`, `ThemePropertyEditor.tsx`, theme-related commands, `_themes/` legacy support.
+- Single theme defined in `src/index.css` (CSS variables) and `src/theme.json` (editor typography).
+- No dark mode support — the app is light-only.
+- Protected folders reduced: `theme/` is no longer scanned by `scan_vault`.
+- Re-evaluation trigger: if dark mode becomes a hard requirement for accessibility or user demand.