deps: upgrade Commander with Node 20 coverage

[rogerchappel]

Summary

• upgrade Commander from 12.1.0 to 14.0.3, the newest release compatible with the declared Node.js 20 floor
• cover representative template listing/init parsing and unknown-option rejection under the upgraded parser
• exercise build, template checks, and CLI smoke behavior on Node.js 20 and 22 in CI
• document the tested runtime contract

Commits

• 92e88d1 deps: upgrade commander for Node 20
• 928750a test: cover commander option rejection
• bd54b8c ci: verify CLI compatibility on Node 20 and 22
• 4b95c7e docs: record supported Node compatibility

Verification

• corepack pnpm install --frozen-lockfile
• corepack pnpm run build
• corepack pnpm test
• bash tests/cli-ux-smoke.sh
• corepack pnpm run release:check
  • generated next-app install, lint, build, production audit, and validation passed
  • package smoke passed (80 files)
• git diff --check origin/main...HEAD
• all four commit authors and committers verified as Roger Chappel <miscanalysis@gmail.com>

CI supplies the requested clean-install compatibility evidence on both supported Node.js 20 and primary Node.js 22.

[rogerchappel]

Automated merge note

Triage class: auto-repair

Summary: Upgrades Commander with Node 20/22 coverage and repairs the release workflows by initializing pnpm before setup-node cache resolution (8 files, +54/-14).

Checks run: all PR checks completed SUCCESS — Node 20 compatibility, Node 22 compatibility, Repository hygiene, Docs hygiene, Generate branchbrief, and Release dry run; local corepack pnpm install --frozen-lockfile, build, test, CLI smoke, release:check, and diff checks passed.

Rebased/CI-repaired: CI repaired on the existing PR branch; no rebase.

Verified head SHA: 29923da.