docs: add installation guide and auto-version README workflow

[utkarsh232005]

Summary

Adds a detailed installation guide to the README and a GitHub Actions workflow that keeps the version numbers in the README in sync with every release.

Changes

README.md

• Replaced the minimal README with a full installation guide covering all platforms the release workflow publishes to:
  • macOS — Homebrew tap + manual tarball (Apple Silicon & Intel)
  • Linux — .deb (Debian/Ubuntu), .rpm (Fedora/RHEL), and raw tarball fallback
  • Windows — .zip download
  • Checksum verification via sha256sums.txt
  • Build from source instructions
• All install commands use a <VERSION> placeholder that gets replaced automatically on release

.github/workflows/update-readme-version.yml

• New standalone workflow that replaces <VERSION> placeholders in the README with the actual release version
• Triggers automatically on release: published
• Also supports manual dispatch (workflow_dispatch) with a version input for ad-hoc updates

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ℹ️ Review info

⚙️ Run configuration

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Run ID: bd67a1f8-32f4-4515-a9bb-c3cbec026f6f

📥 Commits

Reviewing files that changed from the base of the PR and between 7382580 and b57a043.

⛔ Files ignored due to path filters (1)

• README.md is excluded by none and included by none

📒 Files selected for processing (2)

• .github/workflows/release.yml
• .github/workflows/update-readme-version.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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