Add npx support for zero-install trial run

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Description

Ensure bin/mgw.cjs has correct shebang (#!/usr/bin/env node) and that npx mgw --help works without global install. Test: npx . --help from repo root, npx . --version. If the CLI requires commands/ to be deployed to ~/.claude/, document that npx only provides the CLI subset (non-AI commands: sync, issues, link, help) and full install requires command deployment. Update README quick-start with npx example.

Acceptance Criteria

• Add npx support for zero-install trial run

GSD Route

plan-phase

Phase Context

Phase 3: Package Preparation of v1 — NPM Publishing & Distribution

Depends on

create-npmignore-and-verify-clean-packag

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MGW · work-started · 2026-02-27T02:47:32Z
Milestone: v1 — NPM Publishing & Distribution | Phase 3: Package Preparation

Work Started

Issue	#22 — Add npx support for zero-install trial run
Route	plan-phase
Phase	3 of 5 — Package Preparation
Milestone	v1 — NPM Publishing & Distribution

Milestone Progress (2/5 complete)

#	Issue	Status	PR
20	Polish package.json metadata for npm registry	✓ Done	#43
21	Create .npmignore and verify clean package output	✓ Done	#44
22	Add npx support for zero-install trial run	◆ In Progress	—
23	Create CHANGELOG.md with retroactive release history	○ Pending	—
24	Add README badges and publish workflow documentation	○ Pending	—

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MGW · pr-ready · 2026-02-27T02:55:20Z
Milestone: v1 — NPM Publishing & Distribution | Phase 3: Package Preparation

PR Ready

PR #45 — #45

Added npx zero-install support. Verified shebang, tested npx . --help and --version. Documented CLI-only vs AI-powered command tiers in README with Quick Start examples.

Testing procedures posted on the PR.
This issue will auto-close when the PR is merged.

Milestone Progress (3/5 complete)

#	Issue	Status	PR
20	Polish package.json metadata for npm registry	✓ Done	#43
21	Create .npmignore and verify clean package output	✓ Done	#44
22	Add npx support for zero-install trial run	✓ Done	#45
23	Create CHANGELOG.md with retroactive release history	○ Pending	—
24	Add README badges and publish workflow documentation	○ Pending	—