feat: show the isolated-worktree branch in the TUI session title

crates/codeoid-protocol/src/lib.rs

@@ -48,7 +48,8 @@ pub use message::{
     ContentPart, IdentityType, MessageIdentity, MessageRole, SessionMessage, SessionMessageDelta,
 };
 pub use session::{
-    ForkedFrom, SessionInfo, SessionMode, SessionStatus, SessionUsage, Subagent, TurnUsage,
+    ForkedFrom, SessionInfo, SessionMode, SessionStatus, SessionUsage, SessionWorktree, Subagent,
+    TurnUsage,
 };
 pub use tool::{CancelReason, ConfirmedBy, ToolInfo, ToolPhase, ToolState};
 

crates/codeoid-protocol/src/session.rs

@@ -88,6 +88,12 @@ pub struct SessionInfo {
     /// Rendered as a "⑃ from <name>·t<atTurn>" tag in the session title.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub forked_from: Option<ForkedFrom>,
+
+    /// Git worktree backing this session's workdir (fork isolation / bind).
+    /// Absent = shares its workdir with no git isolation. Rendered as a
+    /// "⎇ <branch>" tag in the session title.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub worktree: Option<SessionWorktree>,
 }
 
 /// Where a forked session came from — the parent id, the parent's name at
@@ -101,6 +107,17 @@ pub struct ForkedFrom {
     pub at_turn: u32,
 }
 
+/// A git worktree backing a session's workdir. `created_by_codeoid` marks a
+/// worktree codeoid created for fork isolation (removed on destroy) versus one
+/// the user bound (never touched).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SessionWorktree {
+    pub path: String,
+    pub branch: String,
+    pub created_by_codeoid: bool,
+}
+
 /// Rotation telemetry — how many times the backing Claude Code session has
 /// been rolled over to avoid context compaction.
 #[derive(Debug, Clone, Serialize, Deserialize)]

crates/codeoid-protocol/tests/wire_format.rs

@@ -113,6 +113,11 @@ fn sample_session_info() -> SessionInfo {
             name: "Sandbox".into(),
             at_turn: 12,
         }),
+        worktree: Some(codeoid_protocol::SessionWorktree {
+            path: "/repo-worktrees/fix-a1b2".into(),
+            branch: "codeoid/fix-a1b2".into(),
+            created_by_codeoid: true,
+        }),
     }
 }
 

crates/codeoid-tui/src/app.rs

@@ -2225,6 +2225,7 @@ mod tests {
             fallback_model: None,
             provider_id: None,
             forked_from: None,
+            worktree: None,
         });
         state
     }

crates/codeoid-tui/src/state/mod.rs

@@ -766,6 +766,7 @@ mod tests {
             fallback_model: None,
             provider_id: None,
             forked_from: None,
+            worktree: None,
         }
     }
 

crates/codeoid-tui/src/state/sessions.rs

@@ -129,6 +129,7 @@ mod tests {
             fallback_model: None,
             provider_id: None,
             forked_from: None,
+            worktree: None,
         }
     }
 

crates/codeoid-tui/src/ui/approval.rs

@@ -291,6 +291,7 @@ mod tests {
             fallback_model: None,
             provider_id: None,
             forked_from: None,
+            worktree: None,
         });
         let mut m = msg(
             MessageRole::ToolCall,

crates/codeoid-tui/src/ui/scrollback.rs

@@ -353,6 +353,17 @@ fn session_title(session: &SessionInfo) -> Line<'static> {
                 .fg(Color::Magenta)
                 .add_modifier(Modifier::ITALIC),
         ),
+        // Isolated git worktree — mirrors the web WorktreeChip. Shows the
+        // branch, so a fork running in its own worktree is self-describing.
+        Span::styled(
+            match &session.worktree {
+                Some(w) => format!("  · ⎇ {}", truncate_name(&w.branch, 24)),
+                None => String::new(),
+            },
+            Style::default()
+                .fg(Color::Green)
+                .add_modifier(Modifier::ITALIC),
+        ),
         Span::raw(" "),
     ])
 }
@@ -631,6 +642,7 @@ mod tests {
             fallback_model: None,
             provider_id: None,
             forked_from: None,
+            worktree: None,
         }
     }
 
@@ -969,6 +981,32 @@ mod tests {
         assert!(!title.contains("⑃"), "{title}");
     }
 
+    #[test]
+    fn session_title_shows_worktree() {
+        let mut session = mk_session("wt-1");
+        session.worktree = Some(codeoid_protocol::SessionWorktree {
+            path: "/repo-worktrees/fix-a1b2".into(),
+            branch: "codeoid/fix-a1b2".into(),
+            created_by_codeoid: true,
+        });
+        let title: String = session_title(&session)
+            .spans
+            .iter()
+            .map(|sp| sp.content.clone().into_owned())
+            .collect();
+        assert!(title.contains("⎇"), "{title}");
+        assert!(title.contains("codeoid/fix-a1b2"), "{title}");
+
+        // A session without a worktree shows no worktree tag.
+        let plain = mk_session("s2");
+        let title: String = session_title(&plain)
+            .spans
+            .iter()
+            .map(|sp| sp.content.clone().into_owned())
+            .collect();
+        assert!(!title.contains("⎇"), "{title}");
+    }
+
     #[test]
     fn truncate_name_caps_long_parent_names() {
         assert_eq!(truncate_name("short", 20), "short");

crates/codeoid-tui/src/ui/worker.rs

@@ -372,6 +372,7 @@ mod tests {
             fallback_model: None,
             provider_id: None,
             forked_from: None,
+            worktree: None,
         });
         state.provider_commands.insert(
             "s1".into(),