v0.5.0: NomadArch - Binary-Free Mode Release

Features:
- Binary-Free Mode: No OpenCode binary required
- NomadArch Native mode with free Zen models
- Native session management
- Provider routing (Zen, Qwen, Z.AI)
- Fixed MCP connection with explicit connectAll()
- Updated installers and launchers for all platforms
- UI binary selector with Native option

Free Models Available:
- GPT-5 Nano (400K context)
- Grok Code Fast 1 (256K context)
- GLM-4.7 (205K context)
- Doubao Seed Code (256K context)
- Big Pickle (200K context)

tasks/done/043-color-variable-migration.md

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+# Task 043 - Color Variable Migration
+
+## Goal
+Move all hard-coded color variables from `src/index.css` into `src/styles/tokens.css`, aligning with the documented light and dark palettes.
+
+## Prerequisites
+- Task 042 complete (token scaffolding in place).
+- Access to color definitions from `docs/user-interface.md`.
+
+## Acceptance Criteria
+- [ ] Light mode color tokens (`--surface-*`, `--border-*`, `--text-*`, `--accent`, `--status-success|error|warning`) defined under `:root` in `src/styles/tokens.css`.
+- [ ] Dark mode overrides defined under `[data-theme="dark"]` in the same file.
+- [ ] `src/index.css` no longer declares color variables directly; it references the new tokens instead.
+- [ ] Theme toggle continues to switch palettes correctly.
+
+## Steps
+1. Transfer existing color custom properties from `src/index.css` into `src/styles/tokens.css`, renaming them to semantic names that match the design doc.
+2. Add any missing variables required by the design spec (e.g., `--surface-muted`, `--text-inverted`).
+3. Update `src/index.css` to reference the new semantic variable names where necessary (e.g., `background-color: var(--surface-base)`).
+4. Remove redundant color declarations from `src/index.css` after confirming replacements.
+
+## Testing Checklist
+- [ ] Run `npm run dev` and switch between light and dark themes.
+- [ ] Verify primary screens (instance tabs, session view, prompt input) in both themes for correct colors.
+- [ ] Confirm no CSS warnings/errors in the console.
+
+## Dependencies
+- Depends on Task 042.
+- Blocks Task 044 (typography tokens) and Task 045 (component migration batch 1).
+
+## Estimated Time
+0.5 hours
+
+## Notes
+- Align hex values with `docs/user-interface.md`; note any intentional deviations in the PR description.
+- Provide side-by-side screenshots (light/dark) in the PR for quicker review.