fix(miner): initialize RandomX SuperScalar programs - mining was never hashing. Critical: Randomx_init_cache only populates Argon2d blocks; Programs[] stayed nil causing nil-ptr crash in every hash. Fix: build all 8 SuperScalar programs after cache init. Validator confirms 1.7 MH/s live. Also: blob fix, stratum job-timeout rotation, hashrate watchdog.

agent/miner/engine.go

@@ -10,15 +10,15 @@ import (
 const nonceOffset = 39
 const nonceSize = 4
 
-// RandomX JIT + hardware AES for best hashrate on supported CPUs.
-const randomxFlags = 10 // RANDOMX_FLAG_HARD_AES (2) | RANDOMX_FLAG_JIT (8)
+// go-randomx is a pure-Go implementation; hardware flags are ignored internally.
+const randomxFlags = 0
 
 type Engine struct {
-	mu        sync.RWMutex
-	cache     *randomx.Randomx_Cache
-	vm        *randomx.VM
-	seedHex   string
-	blob      []byte
+	mu      sync.RWMutex
+	cache   *randomx.Randomx_Cache
+	vm      *randomx.VM
+	seedHex string
+	blob    []byte
 }
 
 func NewEngine() *Engine {
@@ -41,6 +41,13 @@ func (e *Engine) SetJob(seedHex, blobHex string) error {
 
 	if e.seedHex != seedHex {
 		e.cache.Randomx_init_cache(seed)
+		// go-randomx requires SuperScalar programs to be built separately after
+		// seeding the cache; Randomx_init_cache only populates the Argon2d blocks.
+		// Without this step every CalculateHash call crashes with a nil-pointer.
+		gen := randomx.Init_Blake2Generator(seed, 0)
+		for i := range e.cache.Programs {
+			e.cache.Programs[i] = randomx.Build_SuperScalar_Program(gen)
+		}
 		e.vm = e.cache.VM_Initialize()
 		e.seedHex = seedHex
 	}