Replace the inline coder_script resource with coder-utils module and
convert scripts/main.sh to scripts/install.sh.tftpl, matching the
pattern used by coder/claude-code and coder-labs/codex.
Changes:
- Replace coder_script.agentapi with module "coder_utils" (v0.0.1)
- Convert scripts/main.sh to scripts/install.sh.tftpl using
templatefile() for variable injection instead of ARG_* env vars
- Keep coder_script.agentapi_shutdown as-is (coder-utils does not
support run_on_stop)
- Keep coder_app resources (web and CLI) unchanged
- Add output "scripts" for downstream sync dependencies
- Simplify agentapi.tftest.hcl assertions (install script content is
now base64-encoded inside the coder-utils wrapper)
b8ae549102