conformance: migrate go onto shared driver (dict, 609/609 parity)

Go has the same structure as erlang: suites load into one session and each
exposes a pass counter plus a *count* (total) counter rather than a fail
counter. MODE=dict fits — each suite's runner is a dict literal
{:passed P :failed (- count P) :total count}. No driver change; conformance.conf
+ 3-line shim, historical scoreboard schema preserved.

Parity verified 609/609 (0 fail), every suite matching baseline.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/go/scoreboard.json

@@ -9,5 +9,6 @@
     {"name":"eval","pass":106,"total":106,"status":"ok"},
     {"name":"runtime","pass":40,"total":40,"status":"ok"},
     {"name":"stdlib","pass":41,"total":41,"status":"ok"},
-    {"name":"e2e","pass":12,"total":12,"status":"ok"}]
+    {"name":"e2e","pass":12,"total":12,"status":"ok"}
+  ]
 }