chore: add conventional commits guidance

[John-David Dalton (jdalton)]

Summary

• Add conventional commits guidance to CLAUDE.md
• Align engines to node >=18.20.8 and pnpm >=10.33.0

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Note

Medium Risk
Mostly documentation and metadata changes, but tightening engines.node/engines.pnpm can break local dev/CI environments that don’t meet the new minimums.

Overview
Adds explicit Conventional Commits guidance to CLAUDE.md, including the expected <type>(<scope>): <description> format and a note that AI attribution is stripped by the commit hook.

Aligns runtime tooling requirements by updating the root package.json engines to require node >=25.9.0 and pnpm >=10.33.0, and removes the per-package engines block from packages/cli/package.json so the repo-level constraints apply.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Node engine version contradicts PR description intent
  • Changed the node engine constraint from >=25.9.0 to >=18.20.8 to match the PR description intent and support all current LTS versions.

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^{Reviewed by Cursor Bugbot for commit f428ab0. Configure here.}