test(coach): register the conversation-history page on the disable invariants

The dedicated conversation-history page gates on the operator master
flag and the per-user opt-out like the main Coach route, so add it to
both grep-based gate-site allowlists.

src/lib/feature-flags/__tests__/coach-cascade.test.tsx

@@ -284,6 +284,10 @@ describe("Coach disable cascade invariant", () => {
     // redirects to `/insights` when the operator master flag is off.
     // v1.18.0 — moved to the standalone top-level `/coach` route.
     "src/app/coach/page.tsx",
+    // v1.21.4 — the dedicated conversation-history page gates on
+    // `flags.coach` like the main Coach route and renders unavailable
+    // when the operator master flag is off.
+    "src/app/coach/conversations/page.tsx",
     // v1.15.20 — the proactive Coach-nudge cron short-circuits on
     // `flags.coach` (gate 1) so an operator kill-switch also silences
     // the nudges. Server-side cron, not a render path — the cascade

src/lib/feature-flags/__tests__/coach-user-disable.test.tsx

@@ -298,6 +298,10 @@ describe("Coach per-user disableCoach invariant", () => {
     // page back to `/insights` instead of painting a dead chat shell.
     // v1.18.0 — moved to the standalone top-level `/coach` route.
     "src/app/coach/page.tsx",
+    // v1.21.4 — the dedicated conversation-history page mirrors the
+    // Coach route gate: operator master flag OR per-user opt-out marks
+    // the page unavailable instead of painting a dead history shell.
+    "src/app/coach/conversations/page.tsx",
     // The hook itself + its `useAuth`-backed reader.
     "src/hooks/use-disable-coach.ts",
     // Cross-cut gates owned by sibling invariants / route tests.