Lead the README with npm install

[guohai]

Makes npm i -g @agora-build/tcap the default install; the install script
becomes the "without Node" alternative. The npm page already led with npm, so
the two now agree.

Generated with SMT smt@agora.build

[github-actions]

🤖 Codex Code Review

No findings. The README-only change correctly makes npm i -g @agora-build/tcap the primary installation method and accurately labels the standalone script as the alternative for systems without Node. It does not affect capture logic, shell hooks, scrollback coordinates, or handling of terminal contents.

[github-actions]

🤖 Claude Code Review

No issues found.

The change is documentation-only: it swaps the order of the two install methods in README.md:32-42, promoting npm i -g @agora-build/tcap over the curl | bash one-liner and relabelling the second as "Or without Node:".

Checks done:

• Accuracy — the package name matches npm/package.json:2 and the npm badge at README.md:4.
• Coverage parity — npm/package.json declares os: [linux, darwin] × cpu: [x64, arm64], the same four targets the tag-driven release builds, so leading with npm doesn't narrow the audience the curl script served. The "Or without Node:" framing correctly names the only real gap (no Node runtime).
• Consistency — npm/README.md already leads with npm, so the two readmes now agree.

No code, shell hooks, or backend coordinate arithmetic are touched, so none of the scrollback or capture-leak concerns apply to this diff.