fix(coder-labs/modules/codex): address review findings from Netero

- Guard jq usage with command -v check; emit a clear error and skip the
  remote MCP fetch when jq is not available (DEREM-1)
- Remove vacuous length assertion in tftest that tested its own input,
  not the module behavior (DEREM-2)
- Replace em-dash with period in test comment (DEREM-3)

registry/coder-labs/modules/codex/main.test.ts

@@ -469,7 +469,7 @@ describe("codex", async () => {
       ).text(),
     });
     // Drop the remote TOML payload at a path the install script will fetch
-    // via file:// — keeps the test self-contained (no external network).
+    // via file://. Keeps the test self-contained (no external network).
     await execContainer(id, [
       "bash",
       "-c",

registry/coder-labs/modules/codex/main.tftest.hcl

@@ -196,11 +196,6 @@ run "test_mcp_config_remote_path" {
     ]
   }
 
-  assert {
-    condition     = length(var.mcp_config_remote_path) == 2
-    error_message = "mcp_config_remote_path should accept a list of URLs"
-  }
-
   assert {
     condition     = strcontains(local.install_script, base64encode(jsonencode(var.mcp_config_remote_path)))
     error_message = "install script should embed the base64-encoded mcp_config_remote_path JSON"

registry/coder-labs/modules/codex/scripts/install.sh.tftpl

@@ -158,6 +158,9 @@ function populate_config_toml() {
   fi
 
   if [ -n "$${ARG_MCP_CONFIG_REMOTE_PATH}" ] && [ "$${ARG_MCP_CONFIG_REMOTE_PATH}" != "[]" ]; then
+    if ! command -v jq > /dev/null 2>&1; then
+      printf "Error: 'jq' is required to process mcp_config_remote_path but was not found. Skipping remote MCP config fetch.\n" >&2
+    else
     for url in $(echo "$${ARG_MCP_CONFIG_REMOTE_PATH}" | jq -r '.[]'); do
       echo "Fetching MCP configuration from: $${url}"
       mcp_toml=$(curl -fsSL "$${url}") || {
@@ -167,6 +170,7 @@ function populate_config_toml() {
       printf "Appending MCP servers from %s\n" "$${url}"
       printf '\n%s\n' "$${mcp_toml}" >> "$${config_path}"
     done
+    fi
   fi
 
   if [ "$${ARG_ENABLE_AI_GATEWAY}" = "true" ] && [ -n "$${ARG_AIBRIDGE_CONFIG}" ]; then