fix(maestro): assert on the git shim log, not a wall-clock budget

a_session_without_a_worktree_costs_no_probe waited up to 5s for the
watcher pass to run, using that wait's timeout panic as an implicit
proxy for "no probe happened". Under a loaded full-workspace run the
watcher task can be scheduled well past 5s, so the test flaked.

Poll the shim log directly for A's probe instead of a derived snapshot
state, and use the wait only as a 30s hang guard. The actual property
- B was never probed - is asserted unconditionally on the log content,
independent of timing.

Fixes #173.

crates/maestro-daemon/tests/blocked_work_cost.rs

@@ -14,7 +14,7 @@ use std::process::Command;
 use std::time::Duration;
 
 use common::{init_bare_repo, init_repo, push_all_to_origin, wait_for_async, DaemonFixture};
-use maestro_protocol::{CreateSessionRequest, InTheWay, WorktreeSpec};
+use maestro_protocol::{CreateSessionRequest, WorktreeSpec};
 use tempfile::TempDir;
 
 fn request(cwd: &std::path::Path, repo: &std::path::Path, branch: &str) -> CreateSessionRequest {
@@ -91,13 +91,12 @@ async fn a_session_without_a_worktree_costs_no_probe() {
         Duration::from_millis(100),
     );
 
-    // The pass demonstrably runs and probed A's tree...
-    wait_for_async(Duration::from_secs(5), || async {
-        fx.manager
-            .snapshot()
-            .await
-            .iter()
-            .any(|s| s.worktree.is_some() && s.blocked_work == Some(InTheWay::default()))
+    // 30s is a hang guard only, not the property under test — that's the
+    // timing-free `contains` check below.
+    wait_for_async(Duration::from_secs(30), || async {
+        std::fs::read_to_string(&log_path)
+            .map(|calls| calls.contains(repo_a.path().to_str().unwrap()))
+            .unwrap_or(false)
     })
     .await;