Fix formatting inconsistencies in README, Terraform scripts, and example variables

terraform.tfvars.example

@@ -1,5 +1,5 @@
 # Copy this file to terraform.tfvars and fill in your values.
 # terraform.tfvars is excluded from git (see .gitignore).
 
-project_id = "your-gcp-project-id"  # required — your existing GCP project
+project_id = "your-gcp-project-id"  # required - your existing GCP project
 prefix     = "gemini"               # optional, default: gemini