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/conformance.conf

@@ -0,0 +1,21 @@
+# Mod conformance config — sourced by lib/guest/conformance.sh.
+
+LANG_NAME=mod
+MODE=dict
+
+PRELOADS=(
+  lib/guest/pratt.sx
+  lib/prolog/tokenizer.sx
+  lib/prolog/parser.sx
+  lib/prolog/runtime.sx
+  lib/prolog/query.sx
+  lib/prolog/compiler.sx
+  lib/mod/schema.sx
+  lib/mod/policy.sx
+  lib/mod/engine.sx
+  lib/mod/api.sx
+)
+
+SUITES=(
+  "decide:lib/mod/tests/decide.sx:(mod-decide-tests-run!)"
+)