M1: evidence types, Source port, ScrubTitle

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/evidence/evidence_test.go

@@ -0,0 +1,46 @@
+package evidence
+
+import (
+	"context"
+	"testing"
+)
+
+func TestScrubTitle(t *testing.T) {
+	cases := []struct{ in, want string }{
+		{"Plain title", "Plain title"},                    // no digits-with-separator: untouched
+		{"Buy 2 eggs", "Buy 2 eggs"},                      // bare integer: untouched (group is mandatory)
+		{"12.5%", ""},                                     // percent decimal: stripped whole
+		{"1:23:45 remaining", " remaining"},               // clock ratio: stripped
+		{"-3.0 delta", " delta"},                          // leading sign + decimal: stripped
+		{"Download 50.5% complete", "Download  complete"}, // embedded percent decimal
+	}
+	for _, c := range cases {
+		if got := ScrubTitle(c.in); got != c.want {
+			t.Errorf("ScrubTitle(%q) = %q, want %q", c.in, got, c.want)
+		}
+	}
+}
+
+// fakeSource satisfies Source for downstream tests and proves the interface shape.
+type fakeSource struct{ snaps []WindowSnapshot }
+
+func (f fakeSource) Watch(ctx context.Context, onChange func(WindowSnapshot)) {
+	for _, s := range f.snaps {
+		onChange(s)
+	}
+	<-ctx.Done()
+}
+
+func TestFakeSourceEmits(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	var got []WindowSnapshot
+	src := fakeSource{snaps: []WindowSnapshot{
+		{Title: "a", Class: "code", Health: EvidenceHealth{Available: true}},
+	}}
+	go src.Watch(ctx, func(s WindowSnapshot) { got = append(got, s) })
+	// Give the goroutine a chance, then cancel.
+	cancel()
+	// We can't assert timing deterministically here; this test only confirms the
+	// types and signature compile and Watch accepts the callback.
+	_ = got
+}