Expand test coverage across server, agent, and web; fix bugs found during audit.

Adds hundreds of unit/integration/e2e tests, fixes WS bcrypt auth, config merge, fleet analytics, agent schedule/log tail, and documents stale PROBLEMS items. Updates PROBLEMS.md, README, and test scripts; ignores local spread-kits and coverage dirs.

agent/miner/stratum_client_test.go

@@ -0,0 +1,70 @@
+package miner
+
+import (
+	"strings"
+	"testing"
+
+	"crypto-miner-agent/config"
+)
+
+func TestNewStratumClient(t *testing.T) {
+	pool := NewPool(1, testPoolCfg(), nil, nil)
+	sc := NewStratumClient(pool, config.RuntimeConfig{})
+	if sc == nil || sc.pool != pool {
+		t.Fatal("NewStratumClient should wire pool")
+	}
+}
+
+func TestStratumSetJobSkipsInvalid(t *testing.T) {
+	pool := NewPool(1, testPoolCfg(), nil, nil)
+	sc := NewStratumClient(pool, config.RuntimeConfig{})
+
+	sc.setJob(nil)
+	sc.setJob(&stratumJob{Blob: ""})
+	pool.mu.RLock()
+	if pool.currentJob != nil {
+		pool.mu.RUnlock()
+		t.Fatal("nil/empty stratum job should not set pool job")
+	}
+	pool.mu.RUnlock()
+
+	sc.setJob(&stratumJob{
+		Blob: strings.Repeat("aa", 76), JobID: "42", Target: "ffff", SeedHash: strings.Repeat("bb", 32), Height: 10,
+	})
+	pool.mu.RLock()
+	defer pool.mu.RUnlock()
+	if pool.currentJob == nil {
+		t.Fatal("valid stratum job should set pool job")
+	}
+	wantBlob := strings.Repeat("aa", 76)
+	if pool.currentJob.ID != "42" || pool.currentJob.Blob != wantBlob {
+		t.Fatalf("pool job mismatch: %+v", pool.currentJob)
+	}
+	wantSeed := strings.Repeat("bb", 32)
+	if pool.currentJob.Target != "ffff" || pool.currentJob.SeedHash != wantSeed {
+		t.Fatalf("pool job fields: %+v", pool.currentJob)
+	}
+}
+
+func TestStratumRunFallbackNoPoolHost(t *testing.T) {
+	pool := NewPool(1, testPoolCfg(), nil, nil)
+	sc := NewStratumClient(pool, config.RuntimeConfig{})
+	stop := make(chan struct{})
+	close(stop)
+	// Should return immediately without dialing.
+	sc.RunFallback(stop)
+}
+
+func TestStratumSetJobMapsToInternalJob(t *testing.T) {
+	pool := NewPool(1, testPoolCfg(), nil, nil)
+	sc := NewStratumClient(pool, config.RuntimeConfig{})
+	sc.setJob(&stratumJob{
+		Blob: strings.Repeat("cc", 76), JobID: "jid", Target: "tgt", SeedHash: strings.Repeat("dd", 32),
+	})
+	pool.mu.RLock()
+	j := pool.currentJob
+	pool.mu.RUnlock()
+	if j == nil || j.ID != "jid" || j.Blob != strings.Repeat("cc", 76) {
+		t.Fatalf("expected internal job, got %+v", j)
+	}
+}