fix(byok-ollama): stop systemd service before rebind + non-zero fallback pricing

.github/workflows/daily-byok-ollama-test.md

@@ -39,6 +39,8 @@ steps:
     env:
       OLLAMA_HOST: "0.0.0.0:11434"
     run: |
+      sudo systemctl stop ollama 2>/dev/null || true
+      sleep 2
       ollama serve &
       echo "Waiting for Ollama service..."
       for i in $(seq 1 30); do
@@ -95,8 +97,8 @@ sandbox:
     sudo: false
 models:
   default-ai-credits-pricing:
-    input: 0
-    output: 0
+    input: 0.000001
+    output: 0.000001
 ---
 
 ### Daily BYOK Endpoint Test

pkg/workflow/compiler_validators.go

@@ -193,6 +193,7 @@ func (c *Compiler) validateCoreToolConfiguration(workflowData *WorkflowData, mar
 		{logMessage: "Validating private-to-public-flows string value", validateFn: func() error { return validatePrivateToPublicFlowsStringValue(workflowData) }},
 		{logMessage: "Validating private-to-public-flows server IDs", validateFn: func() error { return validatePrivateToPublicFlowsServerIDs(workflowData) }},
 		{logMessage: "Validating GCP WIF engine auth required fields", validateFn: func() error { return validateGCPWIFEngineAuth(workflowData) }},
+		{logMessage: "Validating default AI credits pricing values", validateFn: func() error { return validateDefaultAiCreditsPricing(workflowData) }},
 	}
 	// This validation is intentionally outside the table below because strict mode
 	// turns the same validation result into either an error or a warning.

pkg/workflow/model_costs_pricing_validation.go

@@ -0,0 +1,30 @@
+package workflow
+
+import "fmt"
+
+// validateDefaultAiCreditsPricing returns an error when the workflow's
+// models.default-ai-credits-pricing frontmatter is present and any price field
+// has a non-positive value. Absent pricing (nil) is allowed; the check is only
+// enforced once a value is explicitly configured.
+//
+// The AWF api-proxy rejects zero rates as "not configured", so requiring
+// positive values here prevents silent runtime failures for self-hosted models.
+func validateDefaultAiCreditsPricing(workflowData *WorkflowData) error {
+	p := workflowData.DefaultAiCreditsPricing
+	if p == nil {
+		return nil
+	}
+	if p.Input <= 0 {
+		return fmt.Errorf("models.default-ai-credits-pricing: input must be a positive value (got %g); use a small positive rate such as 0.000001 for effectively-free self-hosted models", p.Input)
+	}
+	if p.Output <= 0 {
+		return fmt.Errorf("models.default-ai-credits-pricing: output must be a positive value (got %g); use a small positive rate such as 0.000001 for effectively-free self-hosted models", p.Output)
+	}
+	if p.CachedInput != nil && *p.CachedInput <= 0 {
+		return fmt.Errorf("models.default-ai-credits-pricing: cache_read must be a positive value when set (got %g)", *p.CachedInput)
+	}
+	if p.CacheWrite != nil && *p.CacheWrite <= 0 {
+		return fmt.Errorf("models.default-ai-credits-pricing: cache_write must be a positive value when set (got %g)", *p.CacheWrite)
+	}
+	return nil
+}