[Tunnel] Add changelog for cloudflared architecture deprecation (#33528)

Announces 2027 deprecation of 32-bit Windows and Intel-based macOS builds
Notes security and upstream platform support rationale

Author: jcsf

src/content/changelog/tunnel/2026-09-18-cloudflared-architecture-deprecation.mdx

@@ -0,0 +1,14 @@
+---
+title: cloudflared to deprecate 32-bit Windows and Intel-based macOS builds in 2027
+description: Starting in 2027, Cloudflare will deprecate 32-bit Windows and Intel-based macOS builds of cloudflared and stop publishing releases for either architecture.
+products:
+  - tunnel
+  - cloudflare-tunnel-sase
+date: 2026-09-18
+---
+
+Starting in 2027, Cloudflare will deprecate 32-bit Windows and Intel-based macOS builds of `cloudflared`. After the deprecation takes effect, Cloudflare will no longer publish new `cloudflared` releases for either architecture.
+
+Windows 10, the last Windows release to support 32-bit systems, reached end of support in October 2025. Apple has also deprecated Intel-based Mac computers. macOS 26 Tahoe, released in September 2025, was the final macOS release to support Intel-based Macs. macOS 27, released in September 2026, no longer supports them.
+
+Focusing development on currently supported architectures allows `cloudflared` to align with operating system support and continue receiving updates on supported platforms. For available downloads and supported platforms, refer to the [Cloudflare Tunnel downloads](/tunnel/downloads/) documentation.