bin: add the coder CLI

Pinned to v2.36.5 (latest release). Same shape as the other tarball
installs: the asset drops the tag's leading v and the binary sits at the
archive root. Verified on this box: installs, `coder version` reports
v2.36.5, and a re-run skips it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -45,7 +45,8 @@ Already have a clone? Just run it directly:
   kubectx/kubens, stern, yq, OpenTofu, terragrunt, task (go-task, the
   Taskfile runner), the 1Password CLI `op` for secrets storage, the
   opencode coding agent, zarf (DevSecOps for Offline and Airgapped
-  Kubernetes), and packer (HashiCorp's infrastructure build tool).
+  Kubernetes), packer (HashiCorp's infrastructure build tool), and the
+  coder CLI for Coder workspaces.
   kind is installed only when full (non-rootless) Docker is available —
   it doesn't work against rootless Docker, so it is skipped on Kasm.
   No sudo, nothing outside `$HOME`, so tools persist across Kasm