Fix #1: Validate Terraform import resource names

[shadow6427]

Summary

Add explicit validation for Terraform resource names before import to prevent Terraform state corruption caused by hyphenated names. Fixes #1.

Changes

• Added validate_resource method to TerraformImporter in tools/terraform_import.py.
• Validation checks that resource_name is a valid Terraform identifier (^[a-zA-Z_][a-zA-Z0-9_]*$) and does not contain hyphens.
• Integrated validation into import_batch to reject invalid resources with actionable errors and fail the import.
• Integrated validation into generate_import_script to raise a ValueError for invalid resources instead of writing unsafe commands.
• Added a deterministic validation script tools/test_terraform_import.py with tests covering valid names, hyphenated names, invalid Terraform identifiers, and batch importing behavior.

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

---

• I would like to request that my diagnostic build log is removed before merging