[didagu]

Adds a Next steps section to the README listing the planned improvements, grouped by area. All of them keep hosting at $0.

• CI/CD and deployments: deploy on merge to master; a GitHub production environment plus a /api/version endpoint so you can see when new code is live at the URL; a post-deploy smoke test; preview URLs per PR; CI as a required check; parallel jobs and coverage; a Playwright E2E test; Dependabot auto-merge and Node version alignment; release-please.
• Security and operations: secret scanning, push protection, CodeQL, SECURITY.md, an uptime check, abuse protection.
• Data quality: verify the 24 seed tags, a curation workflow, live verification through the Graph API.
• Product: hashtag suggestions, SEO, privacy-friendly analytics, accessibility, a browser extension.
• Repository: TypeScript 7, issue and PR templates, permalinks in the learning notes, an optional custom domain.

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