feat: implement branch-aware context switching and integrate tantivy fuzzy search index

server/src/models.rs

@@ -26,6 +26,8 @@ pub struct Entity {
     pub observations: Vec<String>,
     #[serde(default = "default_namespace")]
     pub namespace: String,
+    #[serde(default)]
+    pub git_branch: Option<String>,
 }
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
 pub struct Relation {
@@ -51,6 +53,7 @@ pub struct Task {
     pub description: String,
     pub created_at: u64,
     pub updated_at: u64,
+    pub git_branch: Option<String>,
 }
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct Snippet {
@@ -88,6 +91,7 @@ pub struct PinnedFile {
     pub namespace: String,
     pub file_path: String,
     pub timestamp: u64,
+    pub git_branch: Option<String>,
 }
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct SessionSummary {