feat(scheduler-sim-decision-trace): render trace records to text

Task 4.1: hierarchy, summary-level position summaries, truncation marker
with the fixed totals block, 50-host outcome cap with aggregates and
separate limit charges, no-decision and reconstructed records, amounts
in the REPL units mode, identical bytes to one or two sinks.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/scheduler/testsuite/meson.build

@@ -2716,3 +2716,22 @@ sched_trace_hooks_runner_test = executable(
 test('scheduler trace hooks runner test',
      sched_trace_hooks_runner_test, suite: 'scheduler',
      env: ['ASAN_OPTIONS=detect_leaks=0'])
+
+# scheduler-sim-decision-trace task 4.1: the trace renderer (design.md
+# "TraceRenderer"; Requirements 2.4, 2.5, 3.x, 4.x, 5.x, 6.x, 7.6, 7.7,
+# 9.2-9.4). Golden text for full and summary levels, every units mode,
+# truncation, the outcome cap, the no-decision kinds and reconstructed
+# records. Links only the record model, the renderer and the shared REPL
+# formatting module; records are built without the capture sources.
+sched_trace_render_test = executable(
+    'sched_trace_render_test',
+    ['test_trace_render.c', '../src/sched_trace.c',
+     '../src/sched_trace_scan.c', '../src/repl_trace_render.c',
+     '../src/repl_trace_render_outcome.c', '../src/repl_fmt.c'],
+    include_directories:[incdir],
+    dependencies: [scheduler_test_deps],
+    install: false)
+
+test('scheduler trace render test',
+     sched_trace_render_test, suite: 'scheduler',
+     env: ['ASAN_OPTIONS=detect_leaks=0'])