docs: add blueprint section - what's done vs missing

README.md

@@ -155,6 +155,42 @@ VFS:
 
 ---
 
+## 🔲 Blueprint: What's Done vs What's Missing
+
+The grammar is complete. The implementations are not.
+Every missing module follows the **same 7 IR kinds** as the working ones.
+
+### ✅ Working (compiles, boots, verified)
+
+| Module | What it does |
+|---|---|
+| scheduler | spawn/tick/yield, round-robin |
+| memory | page allocator, kmalloc/kfree |
+| filesystem | VFS open/read/write/close/list |
+| crypto | SHA-256, HMAC, AES, RNG |
+| shell | interactive readline, 7 real commands |
+| usb | open/control/descriptor/scan |
+| pcie | init/scan/enable |
+| ata | read/write/identify |
+| x86 | IDT/GDT/MSR/TSS |
+| syscall | write/read/exit/fork/getpid |
+
+### 🔲 Blueprint Ready (needs implementation)
+
+| Module | What to build | Lines |
+|---|---|---|
+| arm64 | GIC, timer, MMU setup | ~200 |
+| riscv | PLIC, CLINT, SATP, SBI | ~200 |
+| gpu | PCI BARs, command buffers, vsync | ~300 |
+| audio | HD Audio controller, DMA buffers | ~250 |
+| virt | KVM ioctls: VMCS, EPT, vCPU run | ~400 |
+| network | TCP state machine, ARP, IP routing | ~500 |
+| smp | IPIs, TLB shootdown, percpu | ~300 |
+
+**All use the same 7 patterns: define, typedef, struct, extern, inline, loop, if, return.**
+
+---
+
 ## 📝 Citation
 
 ```bibtex