feat: index loaded resource discovery

docs/benchmarks/README.md

@@ -16,6 +16,14 @@ The default report is written under `user://`. Pass
 `-- --host-label="<hardware>" --output=res://docs/benchmarks/<name>.json` only
 when intentionally capturing a reviewed project baseline.
 
+Loaded-resource discovery has its own bounded runner:
+
+```bash
+/Applications/Godot.app/Contents/MacOS/Godot \
+  --headless --path "$PWD" \
+  --script res://tools/benchmark_loaded_resource_discovery.gd
+```
+
 Reviewed captures:
 
 - [Simulation scaling baseline 01](SIMULATION_SCALING_BASELINE_01.md) records
@@ -24,3 +32,6 @@ Reviewed captures:
 - [Simulation scaling baseline 02](SIMULATION_SCALING_BASELINE_02.md) records
   checksum-identical results after the shared per-tick population view: the
   600-NPC case is 23.3% faster, while small fixtures expose its fixed cost.
+- [Loaded Resource Discovery 01](LOADED_RESOURCE_DISCOVERY_01.md) compares the
+  former all-node scan with the exact resource-anchor grid at 18, 180, and
+  1,800 loaded sources.