feat(install): add curl install script with docs and tests

[skevetter]

What

Adds a POSIX sh install script so the Devsy CLI installs with one command:

curl -L https://devsy.sh/install.sh | sh

The script lives at sites/docs-devsy-sh/public/install.sh, so the docs site's Netlify static export serves it at https://devsy.sh/install.sh once deployed.

Behavior

• Detects OS (linux/darwin) and architecture (amd64/arm64) from uname; fails clearly on anything else, pointing Windows users at the PowerShell instructions in the docs.
• Downloads the matching devsy-<os>-<arch> binary from the latest GitHub release, or a pinned release with DEVSY_VERSION=v1.19.0.
• Verifies the download's SHA-256 against the release's checksums.txt when one is published; skips with a note when it is not (current releases publish no checksums, matching the existing manual install commands).
• Installs to /usr/local/bin (via sudo when needed), falling back to ~/.local/bin with a PATH warning when neither works; DEVSY_INSTALL_DIR overrides the location.
• DEVSY_RELEASE_BASE_URL overrides the download base for mirrors and tests.
• Functions-only body with main "$@" at the end, so a truncated curl | sh download cannot execute a partial script.

Docs

• getting-started/install.mdx: the install script is now the first CLI option, with the DEVSY_VERSION / DEVSY_INSTALL_DIR knobs documented; Homebrew and per-platform manual commands kept.
• getting-started/update.mdx: re-running the install script is the update path for script installs.

Testing

New hack/install_script Go test package runs the real script end to end against a fake release server:

• latest and pinned-version downloads request the right devsy-<os>-<arch> asset and install it 0755
• checksum verified when published, aborts on mismatch, skips cleanly when absent
• missing asset fails with a clear error
• platform mapping for linux/darwin x amd64/arm64, plus clear failures for Windows shells, unsupported OS, and unsupported arch (via a shimmed uname)
• sh -n syntax check

Local verification: go test ./hack/install_script/ passes; shellcheck and shfmt -i 4 -ci (the repo's pre-commit settings) are clean; npm run build in sites/docs-devsy-sh succeeds and emits out/install.sh.

Notes

• Published through the GitHub web editor (no authenticated git push route from the working environment), so the commits are GitHub-verified web commits.
• Draft: CI needs to settle before review. Not merged, no release, no changes outside this branch.

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📥 Commits

Reviewing files that changed from the base of the PR and between d12223d and d0ca94c.

📒 Files selected for processing (5)

• hack/install_script/doc.go
• hack/install_script/install_test.go
• sites/docs-devsy-sh/content/docs/getting-started/install.mdx
• sites/docs-devsy-sh/content/docs/getting-started/update.mdx
• sites/docs-devsy-sh/public/install.sh

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