feat: load global prompts at startup, add minijinja crate (#1467)

crates/goose/src/agents/capabilities.rs

@@ -11,7 +11,7 @@ use tokio::sync::Mutex;
 use tracing::{debug, instrument};
 
 use super::extension::{ExtensionConfig, ExtensionError, ExtensionInfo, ExtensionResult};
-use crate::prompt_template::{load_prompt, load_prompt_file};
+use crate::prompt_template;
 use crate::providers::base::{Provider, ProviderUsage};
 use mcp_client::client::{ClientCapabilities, ClientInfo, McpClient, McpClientTrait};
 use mcp_client::transport::{SseTransport, StdioTransport, Transport};
@@ -340,12 +340,13 @@ impl Capabilities {
         context.insert("extensions", serde_json::to_value(extensions_info).unwrap());
         context.insert("current_date_time", Value::String(current_date_time));
 
-        // Conditionally load the override prompt or the default system prompt
-        // and set the base prompt to the context
+        // Conditionally load the override prompt or the global system prompt
         let base_prompt = if let Some(override_prompt) = &self.system_prompt_override {
-            load_prompt(override_prompt, &context).expect("Prompt should render")
+            prompt_template::render_inline_once(override_prompt, &context)
+                .expect("Prompt should render")
         } else {
-            load_prompt_file("system.md", &context).expect("Prompt should render")
+            prompt_template::render_global_file("system.md", &context)
+                .expect("Prompt should render")
         };
 
         if self.system_prompt_extensions.is_empty() {