Add root-level AI agent rules for repository-scoped behavior #9696

Job	Run time
🔍 Summary of Git Diff Changes	33s
RT-Thread Online Packages (STM32F407 RT-Spark)	8m 12s
nxp_renesas	17m 17s
stm32_f2_f4	16m 34s
hpmicro	2m 56s
gd32_n32_apm32	9m 15s
Infineon_TI_microchip	11m 26s
stm32f0_f1	10m 10s
nuvoton	7m 6s
others_ft32_mm32_acm32	7m 28s
stm32_f7_g0_h7_mp15_u5_h5_wb5	11m 17s
mips	1m 33s
llvm-arm	7m 2s
aarch64	2m 7s
xuantie-smart	1m 16s
nordic(yml)	13m 45s
at32_hc32_ht32	32m 58s
allwinner-smart	1m 36s
arm-none-bsp-smart	3m 48s
i386-unknown	1m 0s
simulator	1m 24s
riscv64-unknown	2m 0s
RTduino_Arduino Libraries (Raspberry Pico)	11m 8s
K230	7m 36s
ESP32C3	15m 42s
stm32l4	14m 39s
RDK	1m 2s
xuantie	3m 18s
novosns	2m 7s
riscv-none	7m 1s
collect-artifacts	0s
	3h 53m 16s

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