Add vexdo board interactive Ink task board

[ubcent]

Motivation

• Provide a full-terminal task board UI so developers can view and operate on file-based tasks without manually navigating task directories.
• Surface blocked tasks, task counts, and primary actions per-column to streamline common workflows like starting, inspecting, submitting, and opening tasks.

Description

• Add a new CLI command board wired in src/index.ts and implemented at src/commands/board.tsx that launches an Ink app (<Board />).
• Implement board data loader loadBoardState(projectRoot) in src/lib/board.ts to scan tasks/{backlog,in_progress,review,done,blocked}, parse YAML task summaries, mark blocked tasks, and cap done to the 20 most recent files by mtime.
• Add Ink-based TUI component src/components/Board.tsx implementing four columns (Backlog, In Progress, Review, Done), keyboard navigation (←/→/↑/↓, r, q, Ctrl+C), per-column primary actions on Enter, and secondary keys e, l, and confirmed a for abort; blocked tasks are shown in Backlog with a ⚠ prefix.
• Update project config and dependencies to support the UI by adding ink, react, @types/react, and ink-text-input to package.json and enabling JSX with "jsx": "react-jsx" in tsconfig.json, and add unit tests in test/unit/board.test.ts for board state loading.

Testing

• Ran lint with npm run lint and it completed successfully.
• Ran full typecheck with npm run typecheck (tsc --noEmit) and it completed successfully.
• Ran the test suite with npm test (vitest run) and all tests passed (76 tests across unit and integration suites).
• Built the CLI with npm run build and the build completed successfully.

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Codex Task