docs: normalize README usage command block

[MEECHAIN1]

Motivation

• Ensure the README.md uses standard fenced code blocks and contains no artifact markers (leading + or mis-escaped backticks) so git clone/cd/npm install and the run command can be copied and executed directly.

Description

• Add a short context comment inside the Usage fenced code block (# from the project root) and confirm the Installation and other command sections are standard Markdown fenced blocks with no leading + artifact lines.

Testing

• Ran automated validations: rg -n -F '+git clone' README.md, rg -n -F '\```bash' README.md, rg -n '^\+' README.md, and rg -n '```bash' README.md | head, which showed no remaining artifact-style matches.

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Codex Task

[vercel]

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Project	Deployment	Actions	Updated (UTC)
connect.meechain	Error		May 3, 2026 11:34pm
mee-chain-connect	Error		May 3, 2026 11:34pm
meebot	Error		May 3, 2026 11:34pm
meechain	Error		May 3, 2026 11:34pm
meechain-connect	Error		May 3, 2026 11:34pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a5ffd2dc-b6ab-4e42-8168-edb9b6997beb

📥 Commits

Reviewing files that changed from the base of the PR and between 1664b06 and b744c5f.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-readme.md-formatting-and-artifacts

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[railway-app]

🚅 Deployed to the MeeChain-Connect-pr-73 environment in meechain

5 services not affected by this PR

• Redis-wHAO
• Postgres-X79I
• Postgres
• MeeChain
• Redis

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	meechain-connect	b744c5f	May 03 2026, 11:35 PM