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

internal/scoring/skeleton_test.go

@@ -0,0 +1,54 @@
+package scoring
+
+import (
+	"testing"
+
+	"github.com/versenilvis/iris/spec"
+)
+
+func TestExtractSkeleton(t *testing.T) {
+	spec.ResetRegistry()
+	spec.Register(&spec.Spec{
+		Name: "git",
+		Subcommands: []spec.Subcommand{
+			{Name: "checkout"},
+			{Name: "push"},
+		},
+	})
+
+	tests := []struct {
+		name string
+		buf  string
+		want string
+	}{
+		{
+			name: "spec command with args",
+			buf:  "git checkout feature-x",
+			want: "git checkout",
+		},
+		{
+			name: "fallback no spec binary only",
+			buf:  "cargo build --release",
+			want: "cargo",
+		},
+		{
+			name: "fallback single command",
+			buf:  "ls -la",
+			want: "ls",
+		},
+		{
+			name: "empty input",
+			buf:  "   ",
+			want: "",
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := ExtractSkeleton(tc.buf)
+			if got != tc.want {
+				t.Errorf("ExtractSkeleton(%q) = %q, want %q", tc.buf, got, tc.want)
+			}
+		})
+	}
+}