Rename module path to ukrrs.com/mopac/harness

The old path carried the reachableceo org prefix while the repo lives at
git.knownelement.com/ukrrs/MOPAC; the drift was cited as doc rot. go.mod
and every internal import updated; build/vet/test clean in the builder.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

internal/writeback/report.go

@@ -10,7 +10,7 @@ import (
 	"strings"
 	"time"
 
-	"git.knownelement.com/reachableceo/MOPAC/harness/internal/task"
+	"ukrrs.com/mopac/harness/internal/task"
 )
 
 // Report is everything that lands in a REPORT file.

internal/writeback/report_test.go

@@ -7,7 +7,7 @@ import (
 	"testing"
 	"time"
 
-	"git.knownelement.com/reachableceo/MOPAC/harness/internal/task"
+	"ukrrs.com/mopac/harness/internal/task"
 )
 
 func TestWriteProducesReportAndLatest(t *testing.T) {