Add quiet validation wrapper

AGENTS.md

@@ -42,6 +42,18 @@ cmake --preset windows-msvc-default
 cmake --build --preset windows-msvc-default --config Debug --target PanoPainter pano_cli
 ```
 
+Quiet checkpoint validation, preferred when working through Codex token-limited
+sessions:
+
+```powershell
+powershell -ExecutionPolicy Bypass -File scripts\automation\quiet-validate.ps1 -BuildTargets PanoPainter,pano_cli -TestRegex "pp_app_core|pano_cli_plan"
+```
+
+The quiet wrapper writes full command logs under `out/logs/quiet-validation`,
+prints only a compact summary, and applies editable warning/noise filters from
+`scripts/automation/quiet-validation-ignore.txt`. If a step fails, read the
+reported log file instead of rerunning with verbose output.
+
 Focused fast validation:
 
 ```powershell