v1 plan: helpers_test.go as a given file, fake upstream records /v1/models, no /tmp rule; note task 05 findings

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/plans/v1/_files/internal/proxy/helpers_test.go

@@ -0,0 +1,39 @@
+package proxy_test
+
+import (
+	"sync"
+
+	"git.wntrmute.dev/kyle/crossbar/internal/health"
+)
+
+// fakeHealth is a hand-set health table that also records MarkDown calls. It lived in the v0
+// proxy_test.go; the v1 given test replaces that file, so recorder_test.go (which still exercises
+// the nil-lease path through proxy.New) needs it here.
+type fakeHealth struct {
+	mu     sync.Mutex
+	st     map[string]health.Status
+	marked []string
+}
+
+func (f *fakeHealth) Get(name string) (health.Status, bool) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	s, ok := f.st[name]
+	return s, ok
+}
+
+func (f *fakeHealth) MarkDown(name, reason string) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.marked = append(f.marked, name)
+	s := f.st[name]
+	s.Healthy = false
+	s.LastErr = reason
+	f.st[name] = s
+}
+
+func (f *fakeHealth) markedHosts() []string {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	return append([]string{}, f.marked...)
+}