Chisel IP generators

Use this directory for small project-owned Chisel generators before they are promoted into Chipyard integration.

Initial candidates:

NPU register generator
DMA descriptor queue
display register block
interrupt aggregation glue

CPU/AP rule: do not grow a repo-local Chisel application core here. The Linux-capable AP path is the pinned Chipyard/Rocket path in generators/chipyard/eliza-rocket-manifest.json. Chisel blocks in this directory may provide MMIO peripherals or glue consumed by ElizaRocketConfig, but CPU privilege, CSR, trap, cache, MMU, and Linux boot behavior must come from the selected Rocket/Chipyard integration.