feat(pipeline): add WOL validation + time-of-day sampling

Three additions to the Wowee Open Light format that landed
last commit:

  • WoweeLightLoader::sampleAtTime(light, timeMin) returns
    the linearly-interpolated keyframe at any time-of-day,
    correctly handling wrap-around between the last keyframe
    and the first (e.g. 21:00 blends from dusk toward
    midnight by going forward through 00:00).

  • --validate-wol <wol-base> [--json] walks every keyframe
    and reports structural problems: time bounds (must be
    [0, 1440)), strict-ascending sort order, fogEnd >
    fogStart, finite color components. Exit code 0 PASS /
    1 FAIL — CI-friendly.

  • --info-wol-at <wol-base> <HH:MM|minutes> samples the
    interpolated state at a specific time of day. Useful
    for previewing what the renderer would feed in at a
    given moment, debugging keyframe gaps, or previewing
    a sub-range of the cycle.

Smoke-tested: dawn-to-midnight blend at 03:00 yields a
plausible mid-fade ambient (0.18, 0.16, 0.15) and dusk-to-
midnight wrap at 21:00 yields the symmetric (0.19, 0.145,
0.14). The default 4-keyframe day/night cycle from
makeDefaultDayNight passes --validate-wol cleanly.

tools/editor/cli_arg_required.cpp

@@ -15,7 +15,7 @@ const char* const kArgRequired[] = {
     "--list-zone-meshes-detail", "--list-project-meshes-detail", "--info-mesh",
     "--info-mesh-storage-budget", "--info-mesh-stats",
     "--info-wob", "--info-wob-stats", "--info-woc", "--info-wot",
-    "--info-wol", "--gen-light",
+    "--info-wol", "--info-wol-at", "--validate-wol", "--gen-light",
     "--info-creatures", "--info-objects", "--info-quests",
     "--info-extract", "--info-extract-tree", "--info-extract-budget",
     "--list-missing-sidecars",