fix: add random suffix to IDs to prevent collision in concurrent operations

- phase-minus-one.js: GATE-{timestamp}-{random}
- sprint-reporter.js: RPT-{sprintId}-{timestamp}-{random}

Fixes flaky tests caused by Date.now() returning same value in rapid succession

Author: hisaho

src/constitutional/phase-minus-one.js

@@ -51,7 +51,7 @@ class PhaseMinusOneGate {
    * @returns {Promise<Object>} Gate record
    */
   async trigger(options) {
-    const gateId = `GATE-${Date.now()}`;
+    const gateId = `GATE-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
 
     const gate = {
       id: gateId,

src/dashboard/sprint-reporter.js

@@ -37,7 +37,7 @@ class SprintReporter {
    */
   async generateReport(sprint) {
     const report = {
-      id: `RPT-${sprint.id}-${Date.now()}`,
+      id: `RPT-${sprint.id}-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
       sprintId: sprint.id,
       sprintName: sprint.name,
       featureId: sprint.featureId,