test(runner): teach the web fakes to take the step's logs

Claude-Session: https://claude.ai/code/session_01ShuAy8q8ZfPi8KHxwc8JpQ

internal/runner/web_carrier_test.go

@@ -75,6 +75,8 @@ func (d *carrierWebDriver) NextActionFromV8(context.Context) (json.RawMessage, e
 
 func (d *carrierWebDriver) SetLastAction(context.Context, json.RawMessage) error { return nil }
 
+func (d *carrierWebDriver) SetLogs(context.Context, json.RawMessage) error { return nil }
+
 // TestRunner_TransitionalStepNeverAdvancesThePageCarrier pins the ordering the
 // web path depends on. The page-side extractors must run only on steps the
 // verifier accepts: their getters advance spec state every time they evaluate,
@@ -172,6 +174,8 @@ func (d *installFailsWebDriver) SetLastAction(context.Context, json.RawMessage)
 	return errors.New("__sanderlingSetLastAction__ is not a function")
 }
 
+func (d *installFailsWebDriver) SetLogs(context.Context, json.RawMessage) error { return nil }
+
 // TestRunner_LastActionInstallFailureFailsTheRun covers the other half of the
 // same trust boundary. A run that cannot install lastAction in the page cannot
 // apply the page's extractor values either, so the step keeps goja's

internal/runner/web_extractor_trace_test.go

@@ -47,6 +47,8 @@ func (d *webMockDriver) NextActionFromV8(context.Context) (json.RawMessage, erro
 
 func (d *webMockDriver) SetLastAction(context.Context, json.RawMessage) error { return nil }
 
+func (d *webMockDriver) SetLogs(context.Context, json.RawMessage) error { return nil }
+
 // TestRunner_TraceRecordsTheValueTheVerdictUsed fails if the trace and the
 // verdict disagree about an extractor. A witness is only an explanation of a
 // violation if it holds the state the violated property was evaluated against.

internal/runner/web_last_action_test.go

@@ -27,6 +27,7 @@ globalThis.properties = {};
 type tappingWebDriver struct {
 	*mockdriver.Driver
 	installed     []string
+	installedLogs []string
 }
 
 func (d *tappingWebDriver) InstallBundle(context.Context, []byte) error { return nil }
@@ -44,6 +45,11 @@ func (d *tappingWebDriver) SetLastAction(_ context.Context, encoded json.RawMess
 	return nil
 }
 
+func (d *tappingWebDriver) SetLogs(_ context.Context, encoded json.RawMessage) error {
+	d.installedLogs = append(d.installedLogs, string(encoded))
+	return nil
+}
+
 func TestRunner_WebInstallsLastActionInThePage(t *testing.T) {
 	state := newHarnessWithSpec(t, lastActionSpec)
 	web := &tappingWebDriver{Driver: state.mock}