mod: Phase 1 — report schema + policy engine on Prolog, 31/31

Reports → Prolog facts (report/3, classification/2, report_count/2); ordered
policy rules compile to policy_action/3 clauses, first match wins via
pl-query-one. Decisions carry their proof (matching rule + conditions +
evidence). Spam/abuse keyword classification, repeated-report escalation via
Prolog join+arithmetic, no-rule→keep default. Registry api + conformance harness.

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

lib/mod/scoreboard.json

@@ -0,0 +1,10 @@
+{
+  "lang": "mod",
+  "total_passed": 31,
+  "total_failed": 0,
+  "total": 31,
+  "suites": [
+    {"name":"decide","passed":31,"failed":0,"total":31}
+  ],
+  "generated": "2026-06-06T17:30:06+00:00"
+}