diff --git a/web/src/main.ts b/web/src/main.ts
index 788d0f4..e87270d 100644
--- a/web/src/main.ts
+++ b/web/src/main.ts
@@ -28,7 +28,6 @@ import { createPositionMarker } from "./map/marker.ts";
 import { createFollowController } from "./map/follow.ts";
 import { createStatusStrip } from "./ui/strip.ts";
 import { buildBootCard, buildDeniedCard, buildSignalLostCard, startGantry, stopGantry } from "./ui/cards.ts";
-import { createProbe } from "./ui/probe.ts";
 import { telegramLocationSupported } from "./location/telegram.ts";
 import { createRecenterControl } from "./ui/recenter.ts";
 import { getWebApp } from "./telegram/webapp.ts";
@@ -99,11 +98,6 @@ async function boot(): Promise<void> {
     if (lastFix !== null && map !== null) follow?.follow(lastFix);
   });
 
-  // DEBUG-ROUND probe: category-only on-screen telemetry for the device
-  // matrix (webview has no dev-tools); removed at the exit.
-  const probe = createProbe(mainEl);
-  probe.set({ wa: wa ? `${wa.version ?? "?"}/${wa.platform ?? "?"}` : "none", initDataChars: wa ? wa.initData.length : null });
-
   // Cards are built once at boot (boot-time locale) and reused across re-runs.
   const bootCard1 = buildBootCard(locale, 1);
   const bootCard2 = buildBootCard(locale, 2);
@@ -189,7 +183,6 @@ async function boot(): Promise<void> {
   }
 
   function renderState(state: LocationState): void {
-    probe.set({ location: state.kind });
     const ageSec = lastFix !== null ? fixAgeSeconds(lastFix, Date.now()) : null;
     const accuracyM = lastFix !== null ? lastFix.accuracyM : null;
     strip.render(state, ageSec, accuracyM);
@@ -241,7 +234,6 @@ async function boot(): Promise<void> {
   async function runFromSession(): Promise<void> {
     renderState({ kind: "validating" });
     const session = await createSession(wa?.initData ?? "");
-    probe.set({ session: session.ok ? "ok" : session.reason, initDataChars: wa ? wa.initData.length : null });
     if (!session.ok) {
       staleHandled = false; // session-first failure is boot-level, not a stale-fix recovery
       renderDenied();
diff --git a/web/src/shell.css b/web/src/shell.css
index e74f66c..9d1542c 100644
--- a/web/src/shell.css
+++ b/web/src/shell.css
@@ -91,8 +91,4 @@ main { position: fixed; inset: 0; }
 .pos-group[data-stale="true"] { opacity: 0.4; }
 
 /* No CSS transition or animation anywhere — state changes are instant hard swaps. */
-
-/* DEBUG-ROUND probe — on-screen category-only telemetry for the device-matrix
-   loop (no dev-tools in a phone webview). Removed at the exit. Layout-only
-   positioning; the label typography is the existing label-sm token. */
-.diag-probe { position: absolute; left: var(--spacing-margin); bottom: calc(var(--safe-bottom, 0px) + var(--spacing-space-sm)); font: var(--type-label-sm); letter-spacing: var(--type-label-sm-tracking); color: var(--color-soft-beige); z-index: 10; pointer-events: none; }
+/* DEBUG-ROUND probe styles removed at the device-matrix exit (2026-10-23). */
diff --git a/web/src/ui/probe.ts b/web/src/ui/probe.ts
deleted file mode 100644
index 2ce5ca3..0000000
--- a/web/src/ui/probe.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * probe.ts — DEBUG-ROUND diagnostic line (phase 3 device-matrix troubleshooting).
- * ----------------------------------------------------------------------------
- * One category-only instrument line, fixed bottom-left: which WebApp the app
- * sees (version/platform), the character-count of the raw initData (a COUNT,
- * never its content), the last session-gate category, and the location-chain
- * category. No coordinates, no payload, no ids — same law as the Worker's
- * category-only logs (D-14), only surfaced on-screen because a phone
- * webview has no dev-tools access during the device-matrix pass.
- *
- * Rendering uses only machine tokens (letters, digits, separators) — no
- * human copy, so no strings-module entry and no COPY5 concern. The probe is
- * expected to be REMOVED or reduced at the device-matrix exit.
- */
-export interface ProbeParts {
-  wa: string;
-  initDataChars: number | null;
-  session: string;
-  location: string;
-}
-
-export interface Probe {
-  el: HTMLElement;
-  set(parts: Partial<ProbeParts>): void;
-}
-
-export function createProbe(parent: HTMLElement): Probe {
-  const el = document.createElement("div");
-  el.className = "diag-probe";
-  el.setAttribute("aria-hidden", "true");
-  const parts: ProbeParts = { wa: "-", initDataChars: null, session: "-", location: "-" };
-  const state = { parts };
-  function render(): void {
-    const p = state.parts;
-    const q = p.initDataChars === null ? "-" : `${p.initDataChars}ch`;
-    el.textContent = `WA ${p.wa} · q ${q} · s ${p.session} · loc ${p.location}`;
-  }
-  parent.appendChild(el);
-  render();
-  return {
-    el,
-    set(delta: Partial<ProbeParts>): void {
-      Object.assign(state.parts, delta);
-      render();
-    },
-  };
-}