artdag: Phase 2 Analyze on Datalog + 16 tests

analyze.sx projects DAG edges to (edge in out) facts and runs recursive
reachable rules for deps-of/dependents-of/reachable-from/ancestors-of, plus
dirty-closure (dirty(Y):-edge(X,Y),dirty(X)) for incremental recompute. Keystone:
changing a mid node dirties only it + downstream. analyze 16/16, total 36/36.

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

lib/artdag/conformance.sh

@@ -13,7 +13,7 @@ if [ ! -x "$SX_SERVER" ]; then
   exit 1
 fi
 
-SUITES=(dag)
+SUITES=(dag analyze)
 
 OUT_JSON="lib/artdag/scoreboard.json"
 OUT_MD="lib/artdag/scoreboard.md"
@@ -27,7 +27,17 @@ run_suite() {
 (epoch 1)
 (load "spec/stdlib.sx")
 (load "lib/r7rs.sx")
+(load "lib/datalog/tokenizer.sx")
+(load "lib/datalog/parser.sx")
+(load "lib/datalog/unify.sx")
+(load "lib/datalog/db.sx")
+(load "lib/datalog/builtins.sx")
+(load "lib/datalog/aggregates.sx")
+(load "lib/datalog/strata.sx")
+(load "lib/datalog/eval.sx")
+(load "lib/datalog/api.sx")
 (load "lib/artdag/dag.sx")
+(load "lib/artdag/analyze.sx")
 (epoch 2)
 (eval "(define artdag-test-pass 0)")
 (eval "(define artdag-test-fail 0)")