docs: regenerate AGENTS_INDEX.md after AGENTS root update

Author: alpharover

docs/AGENTS_INDEX.md

@@ -3,7 +3,7 @@
 | Agent | Type | Status | Version | Updated | Owner | Path |
 |---|---|---|---|---|---|---|
 | alpha_configs | config | alpha | v2.3 | 2025-08-30 | Alpha SW | [alpha_configs/AGENTS.md](alpha_configs/AGENTS.md) |
-| alpha_project_root | docs | alpha | v2.3 | 2025-08-30 | Tim | [AGENTS.md](AGENTS.md) |
+| alpha_project_root | docs | alpha | v2.3 | 2025-09-01 | Tim | [AGENTS.md](AGENTS.md) |
 | alpha_project_root | docs | alpha | v2.3 | 2025-08-30 | Tim | [examples/AGENTS.md](examples/AGENTS.md) |
 | alpha_bringup | ros2_package | draft | v0.2 | 2025-08-31 | Alpha SW | [alpha_ws/src/alpha_bringup/AGENTS.md](alpha_ws/src/alpha_bringup/AGENTS.md) |
 | alpha_lidar_airy | ros2_package | draft | v0.2 | 2025-08-31 | Alpha SW | [alpha_ws/src/alpha_lidar_airy/AGENTS.md](alpha_ws/src/alpha_lidar_airy/AGENTS.md) |