Capture keyed prompts and source-backed content at load time

internal/promptdef/hash.go

@@ -0,0 +1,19 @@
+package promptdef
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+
+	"gitea.maximumdirect.net/eric/promptkit/internal/domain"
+)
+
+// HashDefinition hashes an execution-ready prompt, including captured content.
+func HashDefinition(definition *domain.PromptDefinition) (string, error) {
+	bytes, err := json.Marshal(definition)
+	if err != nil {
+		return "", err
+	}
+	sum := sha256.Sum256(bytes)
+	return hex.EncodeToString(sum[:]), nil
+}