fix: report a clear cli error when no herdr server is running (#1963)

* fix: report a clear cli error when no herdr server is running

socket cli commands surfaced a raw io::Error debug string
(`Error: Os { code: 2, ... }`) when nothing was listening on the
api socket, which read like a bad --cwd path. map dead-socket
connect failures to a `server_not_running` json error carrying the
resolved socket path, printed once at the edge that surfaces the
error; recovering callers (plugin offline registry fallback, agent
start polling) recognize the marker and keep their existing
behavior.

refs #1941

* fix: map dead-socket errors on the unchecked cli request path

refs #1941

* fix: make server-not-running guidance session-aware

refs #1941

1 files changed, 1 insertions, 8 deletions

diff --git a/src/cli/status.rs b/src/cli/status.rs
index 49b3c129..74bb3e2a 100644
--- a/src/cli/status.rs
+++ b/src/cli/status.rs
@@ -159,20 +159,13 @@ fn read_server_runtime_status() -> std::io::Result<ServerRuntimeStatus> {
             protocol: status.protocol,
             capabilities: status.capabilities,
         }),
-        Err(ApiClientError::Io(err)) if server_not_running_error(&err) => {
+        Err(ApiClientError::Io(err)) if super::server_not_running_error(&err) => {
             Ok(ServerRuntimeStatus::NotRunning)
         }
         Err(err) => Err(api_client_error_to_io(err)),
     }
 }
 
-fn server_not_running_error(err: &std::io::Error) -> bool {
-    matches!(
-        err.kind(),
-        std::io::ErrorKind::NotFound | std::io::ErrorKind::ConnectionRefused
-    )
-}
-
 fn api_client_error_to_io(err: ApiClientError) -> std::io::Error {
     match err {
         ApiClientError::Io(err) => err,