Add ability to attach rules as context (#29109)

Release Notes:

- agent: Added support for adding rules as context.

crates/prompt_store/src/prompts.rs

@@ -15,34 +15,32 @@ use std::{
 };
 use text::LineEnding;
 use util::{ResultExt, get_system_shell};
-use uuid::Uuid;
+
+use crate::UserPromptId;
 
 #[derive(Debug, Clone, Serialize)]
 pub struct ProjectContext {
     pub worktrees: Vec<WorktreeContext>,
     /// Whether any worktree has a rules_file. Provided as a field because handlebars can't do this.
     pub has_rules: bool,
-    pub default_user_rules: Vec<DefaultUserRulesContext>,
-    /// `!default_user_rules.is_empty()` - provided as a field because handlebars can't do this.
-    pub has_default_user_rules: bool,
+    pub user_rules: Vec<UserRulesContext>,
+    /// `!user_rules.is_empty()` - provided as a field because handlebars can't do this.
+    pub has_user_rules: bool,
     pub os: String,
     pub arch: String,
     pub shell: String,
 }
 
 impl ProjectContext {
-    pub fn new(
-        worktrees: Vec<WorktreeContext>,
-        default_user_rules: Vec<DefaultUserRulesContext>,
-    ) -> Self {
+    pub fn new(worktrees: Vec<WorktreeContext>, default_user_rules: Vec<UserRulesContext>) -> Self {
         let has_rules = worktrees
             .iter()
             .any(|worktree| worktree.rules_file.is_some());
         Self {
             worktrees,
             has_rules,
-            has_default_user_rules: !default_user_rules.is_empty(),
-            default_user_rules,
+            has_user_rules: !default_user_rules.is_empty(),
+            user_rules: default_user_rules,
             os: std::env::consts::OS.to_string(),
             arch: std::env::consts::ARCH.to_string(),
             shell: get_system_shell(),
@@ -51,8 +49,8 @@ impl ProjectContext {
 }
 
 #[derive(Debug, Clone, Serialize)]
-pub struct DefaultUserRulesContext {
-    pub uuid: Uuid,
+pub struct UserRulesContext {
+    pub uuid: UserPromptId,
     pub title: Option<String>,
     pub contents: String,
 }
@@ -397,6 +395,7 @@ impl PromptBuilder {
 #[cfg(test)]
 mod test {
     use super::*;
+    use uuid::Uuid;
 
     #[test]
     fn test_assistant_system_prompt_renders() {
@@ -408,8 +407,8 @@ mod test {
                 text: "".into(),
             }),
         }];
-        let default_user_rules = vec![DefaultUserRulesContext {
-            uuid: Uuid::nil(),
+        let default_user_rules = vec![UserRulesContext {
+            uuid: UserPromptId(Uuid::nil()),
             title: Some("Rules title".into()),
             contents: "Rules contents".into(),
         }];