docs: clarify source and binary install paths

[TerminallyLazy]

Summary

• state that the default installer compiles from source and requires Rust/Cargo
• add the verified Linux x86_64 prebuilt install command and current SHA-256
• publish the same truthful guidance in README, llms.txt, and the launch page

Validation

• executed the documented public archive install on Debian Bookworm
• verified v0.13.0 version, init, agent-scoped write, and filtered recall
• SHA appears consistently on all three surfaces
• git diff check passed

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 620afdbf-53dc-4b97-93b5-fe754d999b6f

📥 Commits

Reviewing files that changed from the base of the PR and between 96875d1 and ea037d4.

📒 Files selected for processing (3)

• README.md
• docs/index.html
• docs/llms.txt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/release-install-guidance

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