apl: migrate conformance onto shared lib/guest driver (counters mode)

Replaces the bespoke 116-line conformance.sh with a conformance.conf + 1-line
exec shim, reusing lib/guest/conformance.sh. Surfaced + fixed a silent undercount:
the old awk extractor reported pipeline=40, but pipeline.sx has 152 assertions —
real total is 562/562, not 450/450. Driver reads counter globals directly.

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

lib/apl/scoreboard.json

@@ -9,9 +9,9 @@
     "system": {"pass": 13, "fail": 0},
     "idioms": {"pass": 64, "fail": 0},
     "eval-ops": {"pass": 14, "fail": 0},
-    "pipeline": {"pass": 40, "fail": 0}
+    "pipeline": {"pass": 152, "fail": 0}
   },
-  "total_pass": 450,
+  "total_pass": 562,
   "total_fail": 0,
-  "total": 450
+  "total": 562
 }