feat(scoring): transition workflow learning and fix history UX (#39)

- add transition scoring engine to learn sequential workflows per
directory using command skeletons
- prioritize current active git branch over older branches in
suggestions
- restore strict chronological order for history navigation and bypass
AI re-ranking
- add in-memory session history for instant access to just-run commands
- fix PTY prompt not syncing when using arrow keys in the history menu
- fix history tie-breaker to properly prioritize newer commands by
assigning larger IDs
- fix potential mutex deadlock between bufferMu and pty write during
history navigation
- fix workspace git detection to remove depth limits and correctly
identify repositories with detached HEADs
- fix SQLite connection leaks in frecency queries
- fix global state leaks in history tests by snapshotting and restoring
registry states
- modernize string prefix checks using strings.CutPrefix

root/suggestions_test.go

@@ -20,7 +20,6 @@ func TestMergeResults(t *testing.T) {
 		}
 	})
 
-
 	t.Run("Limit 100", func(t *testing.T) {
 		res := MergeResults("a", "history")
 		if len(res) > 100 {
@@ -50,3 +49,32 @@ func TestMergeResults(t *testing.T) {
 		}
 	})
 }
+
+func TestPrevRecordedCommandState(t *testing.T) {
+	origRegistry := spec.Registry
+	t.Cleanup(func() {
+		spec.Registry = origRegistry
+	})
+
+	spec.ResetRegistry()
+	spec.Register(&spec.Spec{
+		Name: "git",
+		Subcommands: []spec.Subcommand{
+			{Name: "checkout"},
+		},
+	})
+
+	setPrevRecordedInfo("git checkout feature-abc", "/repo/dir")
+	skel, cwd := getPrevRecordedInfo()
+	if skel != "git checkout" || cwd != "/repo/dir" {
+		t.Errorf("expected skel='git checkout' and cwd='/repo/dir', got skel=%q, cwd=%q", skel, cwd)
+	}
+	if gotSkel := getPrevSkeleton(); gotSkel != "git checkout" {
+		t.Errorf("expected getPrevSkeleton()='git checkout', got %q", gotSkel)
+	}
+
+	setPrevRecordedInfo("", "")
+	if gotSkel := getPrevSkeleton(); gotSkel != "" {
+		t.Errorf("expected empty getPrevSkeleton() after reset, got %q", gotSkel)
+	}
+}