feat: add preflight command for development environment check

[caoergou]

Summary

• Add pnpm preflight command to validate development environment
• Check required tools: Node.js (18+), pnpm (10.27.0+), Bun (1.3.9+)
• Check optional tools: cargo, opencode, tauri (for desktop development)
• Provide actionable hints when tools are missing or outdated

Changes

File	Type	Description
scripts/preflight.mjs	New	Preflight check script with colored output
package.json	Modified	Add preflight script
README.md	Modified	Document preflight command

Features

• Required tools check: Node.js, pnpm, Bun with version validation
• Optional tools check: cargo, opencode, tauri for desktop development
• Version comparison: Warn if tool version is below minimum required
• Color support: Respects NO_COLOR and CI environments
• Actionable hints: Provides installation instructions for missing tools

Test Plan

# Run preflight check
pnpm preflight

# Expected output:
# ✓ node: v22.x.x
# ✓ pnpm: 10.27.x
# ✓ bun: 1.3.x
# ...
# ✓ Preflight passed

This is split from the original PR #788 as suggested by @OmarMcAdam.

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The following comment was made by an LLM, it may be inaccurate:

[caoergou]

Hi @OmarMcAdam — since you mentioned you check PRs daily on #854, wanted to flag that this PR (#852 preflight + #853 verify) are part of the same dev-workflow improvement theme as the CI typecheck in #854.

Happy to consolidate or adjust scope if that'd be easier to review together!

[jcllobet]

@caoergou can you solve the merge conflicts for preflight?

Regarding the type validation in #853 , it may be trickier as we would have to change or skip a lot of things with the TS linter atm but i'll defer to @OmarMcAdam for his opinion.

[caoergou]

Hi @jcllobet, the merge conflicts have been resolved! The branch has been rebased onto the current dev branch.