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/v1/05-proxy.md

@@ -22,6 +22,7 @@ real `store`, `lease.Table`, `limiter` and `health.Table`.
 ## Files
 
 - Copy (**replaces** v0's file): `internal/proxy/proxy_test.go`
+- Copy: `internal/proxy/helpers_test.go` (the `fakeHealth` helper that v0's `proxy_test.go` held and `recorder_test.go` still needs)
 - Modify: `internal/proxy/proxy.go` (split into more files if it passes 400 lines: `proxy.go`, `tee.go`, `hosts.go`), `docs/implementer-log.md`
 - Keep: `internal/proxy/recorder_test.go` from v0.1 — it must still pass. Its `proxy.New(cfg, h, nil)`
   call no longer compiles, so **this is the one given test you edit**: change that call to
@@ -97,7 +98,8 @@ func SplitRoute(path string) (route, rest string, ok bool)
 
 ## Steps
 
-- [ ] **1. Copy (replace).** `git switch v1`; `cp docs/plans/v1/_files/internal/proxy/proxy_test.go internal/proxy/proxy_test.go`.
+- [ ] **1. Copy (replace).** `git switch v1`; `cp docs/plans/v1/_files/internal/proxy/proxy_test.go internal/proxy/proxy_test.go`;
+  `cp docs/plans/v1/_files/internal/proxy/helpers_test.go internal/proxy/`.
   Edit the one call in `internal/proxy/recorder_test.go` as described above.
 - [ ] **2. See it fail** (compile). **3. Write the code.** `gofmt -w internal/proxy/`.
 - [ ] **4. See it pass.** `go test -race -count=1 ./internal/proxy/`. `TestDifferentConversationsSpreadByFreeSlots`