refactor(docs): strip residual Phase/Plan setup-history references

Final sweep for setup-process bookkeeping not caught by template-reset-v1.
ADRs drop Plan-N qualifiers; spec collapses the historical 11-phase
migration table; scaffolding guide drops "Phase added" column; comment
prefixes referencing R-numbers in test describes / eslint inline comments
are normalized. Architecture-level rule IDs (R40, R52, E0, J0, etc.) are
preserved where they serve as stable cross-references in ADRs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/core-testing/src/setup/no-instrumentation.ts

@@ -1,7 +1,7 @@
 import { vi } from "vitest";
 
 /**
- * R49 — guard against real Sentry SDK + OTel SDK initialization in test processes.
+ * Guard against real Sentry SDK + OTel SDK initialization in test processes.
  *
  * Mocks @sentry/* and key @opentelemetry/sdk-* modules at the module level so
  * any code that imports them receives a no-op surface. Tests that need to assert
@@ -78,8 +78,12 @@ vi.mock("@opentelemetry/sdk-node", () => ({
     BatchSpanProcessor: class {
       onStart() {}
       onEnd() {}
-      forceFlush() { return Promise.resolve(); }
-      shutdown() { return Promise.resolve(); }
+      forceFlush() {
+        return Promise.resolve();
+      }
+      shutdown() {
+        return Promise.resolve();
+      }
     },
   },
 }));
@@ -88,8 +92,12 @@ vi.mock("@sentry/opentelemetry", () => ({
   SentrySpanProcessor: class {
     onStart() {}
     onEnd() {}
-    forceFlush() { return Promise.resolve(); }
-    shutdown() { return Promise.resolve(); }
+    forceFlush() {
+      return Promise.resolve();
+    }
+    shutdown() {
+      return Promise.resolve();
+    }
   },
   // SentryLogRecordProcessor does NOT exist in @sentry/opentelemetry v10 — omitted.
   // No-op Sentry.init wrapper used by sentry-bridge.ts