mod: Ext 11 — batch triage + corpus analytics, 277/277

mod/decide-batch triages a queue; mod/action-histogram summarizes outcomes by
action; mod/rule-coverage + mod/never-fired measure which rules fire across a
corpus — the empirical complement to lint's static unreachable check (lint finds
rules that can't fire; never-fired finds rules that didn't). +17 tests.

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

lib/mod/conformance.conf

@@ -19,6 +19,7 @@ PRELOADS=(
   lib/mod/quorum.sx
   lib/mod/trace.sx
   lib/mod/whatif.sx
+  lib/mod/batch.sx
   lib/mod/lifecycle.sx
   lib/mod/audit.sx
   lib/mod/api.sx
@@ -40,4 +41,5 @@ SUITES=(
   "quorum:lib/mod/tests/quorum.sx:(mod-quorum-tests-run!)"
   "trace:lib/mod/tests/trace.sx:(mod-trace-tests-run!)"
   "whatif:lib/mod/tests/whatif.sx:(mod-whatif-tests-run!)"
+  "batch:lib/mod/tests/batch.sx:(mod-batch-tests-run!)"
 )