feat(nothooks): add phase-aware hook runner with setup-hook state tracking

crates/nothooks/src/runner.rs

@@ -0,0 +1,44 @@
+use std::path::PathBuf;
+use std::process::Command;
+use notcore::{HookPhase, HookSpec};
+use crate::HookResult;
+use crate::state::HookState;
+
+pub struct HookRunner {
+    state_dir: PathBuf,
+    force: bool,
+}
+
+impl HookRunner {
+    pub fn new(state_dir: PathBuf) -> Self {
+        Self { state_dir, force: false }
+    }
+
+    pub fn with_force(state_dir: PathBuf) -> Self {
+        Self { state_dir, force: true }
+    }
+
+    pub fn run_hook(&self, spec: &HookSpec) -> HookResult {
+        let mut state = HookState::load(&self.state_dir).unwrap_or_default();
+
+        if spec.phase == HookPhase::Setup && !self.force && state.is_done(&spec.name) {
+            return HookResult::Skipped;
+        }
+
+        let result = Command::new("nu")
+            .arg(&spec.script)
+            .status();
+
+        match result {
+            Ok(status) if status.success() => {
+                if spec.phase == HookPhase::Setup {
+                    state.mark_done(&spec.name);
+                    let _ = state.save(&self.state_dir);
+                }
+                HookResult::Ok
+            }
+            Ok(status) => HookResult::Failed(format!("exit code {}", status.code().unwrap_or(-1))),
+            Err(e) => HookResult::Failed(e.to_string()),
+        }
+    }
+}