## Description
<!-- Briefly describe what this PR does and why -->
## Type of Change
- [ ] New module
- [ ] New template
- [ ] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [ ] Other
## Module Information
<!-- Delete this section if not applicable -->
**Path:** `registry/[namespace]/modules/[module-name]`
**New version:** `v1.0.0`
**Breaking change:** [ ] Yes [ ] No
## Template Information
<!-- Delete this section if not applicable -->
**Path:** `registry/[namespace]/templates/[template-name]`
## Testing & Validation
- [ ] Tests pass (`bun test`)
- [ ] Code formatted (`bun fmt`)
- [ ] Changes tested locally
## Related Issues
<!-- Link related issues or write "None" if not applicable -->
## Summary
- Introduces Terraform native tests (`terraform test`) alongside
existing Bun tests
- Migrates tests for modules: jetbrains, zed, and code-server
- Removes Bun test files for these migrated modules only
- Adds repo-wide test runner script for Terraform tests
- Updates docs and new-module sample to reflect Terraform tests
## Transition plan
- Mixed mode: Other modules retain Bun tests; CI should run both Bun and
Terraform tests temporarily
- Follow the linked epic to migrate remaining modules
## Test plan
- Run: `./scripts/terraform_test_all.sh` (passes locally)
- Bun tests still available for non-migrated modules
## Affected paths
- registry/coder/modules/jetbrains/jetbrains.tftest.hcl
- registry/coder/modules/zed/zed.tftest.hcl
- registry/coder/modules/code-server/code-server.tftest.hcl
- scripts/terraform_test_all.sh
- examples/modules/MODULE_NAME.tftest.hcl
- CONTRIBUTING.md
Contributes to #308
Replace Bun-based test runner with Terraform native testing. Adds script to discover and run tests across modules and updates docs/scripts to use terraform test.
