Bugs-evident cleanup: cable-measure failure is fatal with its reason (failed/fail pretend-path and dead relinked plumbing deleted), bcm.command refuses partial SETs (0 or 5 params, stale-DATA trap made structural), BOOT gains a patched-ixgbe check naming stock-driver boots, panel fault rows matched by label and console rows strict on column count, phy.go split into sff/bcm/rollball and main.go's direction machinery into direction.go (pure moves), input events decoded via encoding/binary, gofmt; verified on hardware (20.00G, zero errors, ECD 41m)

phy_test.go

@@ -55,7 +55,6 @@ func TestCableSummary(t *testing.T) {
 		{"one-end map only", cableInfo{ecd: healthy, maps: [2]byte{pairIdentityMap, 0}, haveMaps: [2]bool{true, false}}, false, "49", clsGood},
 		{"fault", cableInfo{ecd: ecdResult{verdicts: [4]int{pairOK, pairShort, pairXtalk, pairOK}, metres: [4]int{50, 12, 30, 51}}}, false, "SHORT", clsBad},
 		{"fault beats swap", cableInfo{ecd: ecdResult{verdicts: [4]int{pairOpen, pairOK, pairOK, pairOK}}, maps: [2]byte{pairIdentityMap, 0xE1}, haveMaps: [2]bool{true, true}}, false, "OPEN", clsBad},
-		{"diag failed", cableInfo{failed: true}, false, "fail", clsBad},
 		{"no diag yet", cableInfo{}, false, "-", clsNone},
 		{"measuring", cableInfo{ecd: healthy, maps: [2]byte{pairIdentityMap, pairIdentityMap}, haveMaps: [2]bool{true, true}}, true, "-", clsNone},
 	} {
@@ -106,4 +105,3 @@ func TestSNRClass(t *testing.T) {
 		}
 	}
 }
-