refactor: split agent detection by agent

Move screen detection into per-agent modules and keep visible-state arbitration centralized in terminal state.

Tighten Codex prompt-scoped working detection and Claude hook/screen recovery for stale blocked and idle reports.

Add a focused just recipe for single-test runs.

refs #349

refs #352

1 files changed, 36 insertions, 0 deletions

diff --git a/src/detect/agents/grok.rs b/src/detect/agents/grok.rs
new file mode 100644
index 00000000..75b5cd35
--- /dev/null
+++ b/src/detect/agents/grok.rs
@@ -0,0 +1,36 @@
+use super::super::{has_braille_spinner, AgentState};
+
+/// Grok Build detection.
+///
+/// Blocked permission prompts display a whitelist scope selector with choices
+/// like "Yes, proceed" and "No, reject". Working turns show a braille spinner
+/// status line such as "⠋ Waiting… 1.8s" plus live controls like
+/// "Ctrl+c:cancel" and "Ctrl+Enter:interject".
+pub(super) fn detect(content: &str) -> AgentState {
+    let lower = content.to_lowercase();
+
+    if lower.contains("use ← → to choose permission whitelist scope")
+        || lower.contains("yes, proceed")
+        || lower.contains("no, reject")
+        || lower.contains("ctrl+o:yolo")
+        || lower.contains(":scope")
+    {
+        return AgentState::Blocked;
+    }
+
+    if has_braille_spinner(content)
+        && (lower.contains("waiting")
+            || lower.contains("run ")
+            || lower.contains("read ")
+            || lower.contains("search ")
+            || lower.contains("list "))
+    {
+        return AgentState::Working;
+    }
+
+    if lower.contains("ctrl+c:cancel") && lower.contains("ctrl+enter:interject") {
+        return AgentState::Working;
+    }
+
+    AgentState::Idle
+}