HS: sourceInfo — exempt suite from 200k step limit (+2 tests)

hs-upstream-core/sourceInfo tests "get source works for expressions"
and "get line works for statements" each call hs-parse-ast which runs
the full parser with span-mode enabled, creating ~15 wrapped AST nodes
and linking :next fields. The total CEK step count exceeds the 200k
default but terminates correctly around 400-500k steps. Adding the
suite to _NO_STEP_LIMIT_SUITES (no cap) lets both tests pass.
The other two sourceInfo tests were already passing. 4/4 now.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/hs-run-filtered.js

@@ -921,6 +921,7 @@ for(let i=startTest;i<Math.min(endTest,testCount);i++){
   // Suites where JIT cascade legitimately exceeds the per-test step limit.
   const _NO_STEP_LIMIT_SUITES = new Set([
     "hs-upstream-core/runtimeErrors",
+    "hs-upstream-core/sourceInfo",
     "hs-upstream-expressions/collectionExpressions",
     "hs-upstream-expressions/typecheck",
     "hs-upstream-socket",