feat: add initial socket api for workspace and pane control

add unix socket request/response api scaffolding

implement initial workspace and pane commands:
- ping
- workspace.list
- workspace.get
- workspace.create
- pane.list
- pane.get
- pane.read
- pane.send_text
- pane.send_keys
- pane.wait_for_output

improve pane read semantics:
- visible trims trailing blank viewport rows
- recent reads from parser scrollback/current screen
- wait_for_output returns matched snapshot plus matched_line

add real subprocess integration tests for socket api

1 files changed, 5 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 6bcaa111..e3c54541 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,6 +18,7 @@ const NESTED_HERDR_MESSAGES: [&str; 6] = [
     "recursion detected. base case not found. aborting.",
 ];
 
+mod api;
 mod app;
 mod config;
 mod detect;
@@ -223,6 +224,9 @@ fn main() -> io::Result<()> {
 
     init_logging();
 
+    let (api_tx, api_rx) = std::sync::mpsc::channel();
+    let _api_server = api::start_server(api_tx)?;
+
     let no_session = std::env::args().any(|a| a == "--no-session");
     let in_tmux = std::env::var("TMUX").is_ok();
 
@@ -284,7 +288,7 @@ fn main() -> io::Result<()> {
             std::io::stdout().flush()?;
         }
 
-        let mut app = app::App::new(config, no_session, config_diagnostic);
+        let mut app = app::App::new(config, no_session, config_diagnostic, api_rx);
         let result = app.run(&mut terminal).await;
 
         // Reset modifyOtherKeys if we enabled it