Simplify install.sh: md5 checksum + python3 site-based install dir#1

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Copilot wants to merge 8 commits into

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copilot/add-prebuilt-ursh-binaries

Commits on Mar 24, 2026

Initial plan
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Initial plan

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kristopolous
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Ship prebuilt ursh binaries via GitHub Releases and update installer

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kristopolous
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Simplify install URL: bootstrap at day50.dev/ursh fetches real installer from GitHub

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kristopolous
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Rename: install.sh→bootstrap.sh (stable/scp'd), installer.sh→install.sh (real logic)

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kristopolous
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Revert README.md to main — no README changes in this PR

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kristopolous
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Simplify checksum verification to use md5 only

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kristopolous
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Replace detect_install_dir heuristic with python3 -msite --user-base

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kristopolous
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