Make install.md Step 3 cross-platform (drop git clone)

[Copilot]

Step 3 of install.md used git clone plus bash-only cp/mkdir -p//tmp, which doesn't work on Windows and pulls full git history unnecessarily.

Changes to install.md Step 3

• Switched from git clone to a zip download. Removes the git dependency and avoids downloading .git history.
• Split into two snippets, each in a collapsible <details> block:
  • Linux/macOS: curl + unzip, with a tar -xf fallback noted for minimal images that lack unzip.
  • Windows (PowerShell): Invoke-WebRequest + Expand-Archive, using $env:TEMP instead of /tmp.
• Added a version-pinning note describing how to swap refs/heads/main for refs/tags/<tag>.
• Used cp -R src/. dst/ (rather than src/*) so hidden files would be copied if any are ever added, and to avoid glob edge cases.

Example (Linux/macOS)

curl -fL https://github.com/githubnext/autoloop/archive/refs/heads/main.zip -o /tmp/autoloop.zip
unzip -q /tmp/autoloop.zip -d /tmp/autoloop_extract
mkdir -p .github/workflows .github/ISSUE_TEMPLATE .autoloop/programs
cp -R /tmp/autoloop_extract/autoloop-main/workflows/. .github/workflows/
cp -R /tmp/autoloop_extract/autoloop-main/.github/ISSUE_TEMPLATE/. .github/ISSUE_TEMPLATE/
rm -rf /tmp/autoloop.zip /tmp/autoloop_extract

Notes / trade-offs

• Both snippets track the default branch, matching prior behavior; the new note documents how to pin a tag.
• Verified the bash snippet end-to-end: .github/workflows/ (including shared/ and scripts/), .github/ISSUE_TEMPLATE/autoloop-program.md, and .autoloop/programs/ are populated as expected. PowerShell snippet was not executed in this environment.