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>

plans/agent-briefings/conformance-loop.md

@@ -89,7 +89,7 @@ Blocked with specifics and move to the next candidate next iteration.
 - [x] erlang — migrated 761/761 (dict; pass/count → :failed = count-pass)
 - [x] feed — migrated 189/189 (counters; test-harness.sx preload for counters+helper)
 - [~] forth — excluded: foreign Forth corpus (Hayes core.fr) via awk+python preprocessing
-- [ ] go
+- [x] go — migrated 609/609 (dict; pass/count → :failed = count-pass, like erlang)
 - [ ] js
 - [ ] ocaml
 - [ ] smalltalk
@@ -100,6 +100,11 @@ Blocked with specifics and move to the next candidate next iteration.
 
 ## Progress log (newest first)
 
+- 2026-06-07 — go: migrated to `MODE=dict`, 609/609 exact parity (lex 129, parse 179,
+  types 102, eval 106, runtime 40, stdlib 41, e2e 12). Same shape as erlang — one-session
+  load, per-suite pass + *count* (total) counters — so each suite's dict-literal runner
+  computes `:failed (- count pass)`. No driver change; conformance.conf + shim only.
+  Kept historical scoreboard schema (language/total_pass/total/suites[name,pass,total,status]).
 - 2026-06-07 — forth: EXCLUDED (foreign-runner, like lua/smalltalk). Its conformance.sh
   reads a foreign Forth corpus (lib/forth/ans-tests/core.fr, the gerryjackson Hayes Core
   suite), preprocesses it with awk (strip `\` / `( )` comments + TESTING lines), splits it