feat(prompts): load system prompts and defaults from Docker volume; set runtime system prompt; add BACKBEAT standards

pkg/prompt/types.go

@@ -0,0 +1,22 @@
+package prompt
+
+// RoleDefinition represents a single agent role loaded from YAML.
+type RoleDefinition struct {
+    ID          string   `yaml:"id"`
+    Name        string   `yaml:"name"`
+    Description string   `yaml:"description"`
+    Tags        []string `yaml:"tags"`
+    SystemPrompt string  `yaml:"system_prompt"`
+    Defaults    struct {
+        Models       []string `yaml:"models"`
+        Capabilities []string `yaml:"capabilities"`
+        Expertise    []string `yaml:"expertise"`
+        MaxTasks     int      `yaml:"max_tasks"`
+    } `yaml:"defaults"`
+}
+
+// RolesFile is the top-level structure for a roles YAML file.
+type RolesFile struct {
+    Roles map[string]RoleDefinition `yaml:"roles"`
+}
+