Migrate from pnpm to bun

[google-labs-jules]

Migrated the project from pnpm to Bun.

• Replaced pnpm-workspace.yaml with workspaces in package.json.
• Added mise.toml to manage Node 24 and Bun 1.
• Updated .github/workflows/deploy-docs.yml to use oven-sh/setup-bun and run bun commands.
• Updated husky hooks and AGENTS.md.
• Verified build with bun run build.

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PR created automatically by Jules for task 773986877751336960 started by @gracefullight

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