fix(buildspec): flatten multi-line curl commands to single lines

YAML sequence items cannot span multiple lines without a block scalar.
The split curl commands were parsed as invalid mappings at line 44.

codebuild/buildspec.yml

@@ -33,17 +33,14 @@ phases:
     commands:
       # ── Install terraform ────────────────────────────────────────────────
       - echo "Installing terraform ${TF_VERSION}..."
-      - curl -sLo /tmp/tf.zip
-          "https://releases.hashicorp.com/terraform/${TF_VERSION}/terraform_${TF_VERSION}_linux_amd64.zip"
+      - curl -sLo /tmp/tf.zip "https://releases.hashicorp.com/terraform/${TF_VERSION}/terraform_${TF_VERSION}_linux_amd64.zip"
       - unzip -q /tmp/tf.zip -d /usr/local/bin && rm /tmp/tf.zip
       - terraform version
 
       # ── Install tf wrapper script from team gist ─────────────────────────
       # GITHUB_TOKEN is already in the environment (injected from Secrets Manager).
       - echo "Downloading tf script from gist..."
-      - curl -sLo /usr/local/bin/tf
-          -H "Authorization: token $GITHUB_TOKEN"
-          "$TF_GIST_URL"
+      - curl -sLo /usr/local/bin/tf -H "Authorization: token $GITHUB_TOKEN" "$TF_GIST_URL"
       - chmod +x /usr/local/bin/tf
       - tf --version