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.md

@@ -12,5 +12,4 @@
 | ✅ | stdlib | 41 | 41 |
 | ✅ | e2e | 12 | 12 |
 
-
 Generated by `lib/go/conformance.sh`.