docs(readme): link ecosystem badges + move Beta callout to bottom

Three operator-feedback corrections to the README:

1. Every ecosystem badge in the top row now links to a real
   destination — Home Assistant -> integrations/home-assistant.md,
   Matter -> ADR-122, Apple Home -> user-guide-apple-homepod.md,
   Google Home + Alexa -> the HA integration doc (both ecosystems
   reach RuView through HA's bridge today). Added an Alexa badge
   alongside the existing four so all four major ecosystems are
   represented. Dropped the now-redundant separate "HomePod
   Integration" badge — the Apple Home badge linking to the same
   guide is enough.

2. Beta callout moved from line 14 (under the hero image) to a
   dedicated `## Beta software` section immediately before the
   License. The callout's content is unchanged; it just no longer
   gates the elevator pitch. Readers see the value proposition
   first, the caveats at the bottom alongside license + support.

3. The intro paragraph ("Turn ordinary WiFi into ...") now ends
   with a one-line summary of native ecosystem support naming all
   four — Home Assistant, Apple Home & HomePod, Google Home, Alexa —
   plus the Matter endpoint, each linked. The previous mention of
   ecosystems was buried further down the page; this surfaces it
   in the intro where the user reads first.

Co-Authored-By: claude-flow <ruv@ruv.net>

README.md

@@ -11,18 +11,13 @@
   </a>
 </p>
 
-> **Beta Software** — Under active development. APIs and firmware may change. Known limitations:
-> - ESP32-C3 and original ESP32 are not supported (single-core, insufficient for CSI DSP)
-> - Single ESP32 deployments have limited spatial resolution — use 2+ nodes or add a [Cognitum Seed](https://cognitum.one) for best results
-> - Camera-free pose accuracy is limited (PCK@20 ≈ 2.5% with proxy labels) — [camera ground-truth training](docs/adr/ADR-079-camera-ground-truth-training.md) targets **35%+ PCK@20**; the pipeline is implemented, but the data-collection and evaluation phases (ADR-079 P7–P9) are still pending.
->
-> Contributions and bug reports welcome at [Issues](https://github.com/ruvnet/RuView/issues).
-
 ## **See through walls with WiFi** ##
 
 **Turn ordinary WiFi into a spatial intelligence / sensing system.** Detect people, measure breathing and heart rate, track movement, and monitor rooms — through walls, in the dark, with no cameras or wearables. Just physics.
 
-![Works with Home Assistant](https://img.shields.io/badge/Works%20with-Home%20Assistant-blue?logo=home-assistant&logoColor=white&labelColor=41BDF5) ![Works with Matter](https://img.shields.io/badge/Works%20with-Matter-blue?labelColor=4285F4) ![Works with Apple Home](https://img.shields.io/badge/Works%20with-Apple%20Home-black?logo=apple) [![HomePod Integration](https://img.shields.io/badge/HomePod%20Integration-Native%20HAP-black?logo=apple)](docs/user-guide-apple-homepod.md) ![Works with Google Home](https://img.shields.io/badge/Works%20with-Google%20Home-blue?logo=googlehome)
+Works natively with the four major smart-home ecosystems: **[Home Assistant](docs/integrations/home-assistant.md)** via the HA-DISCO MQTT publisher, **[Apple Home & HomePod](docs/user-guide-apple-homepod.md)** as a discoverable HAP-1.1 bridge, **[Google Home](docs/integrations/home-assistant.md)** + **[Amazon Alexa](docs/integrations/home-assistant.md)** via the same HA bridge or a [Matter](docs/adr/ADR-122-bfld-ruview-ha-matter-exposure.md) endpoint. Siri, Google Assistant, and Alexa can voice presence and vitals by room with zero custom skills.
+
+[![Works with Home Assistant](https://img.shields.io/badge/Works%20with-Home%20Assistant-blue?logo=home-assistant&logoColor=white&labelColor=41BDF5)](docs/integrations/home-assistant.md) [![Works with Matter](https://img.shields.io/badge/Works%20with-Matter-blue?labelColor=4285F4)](docs/adr/ADR-122-bfld-ruview-ha-matter-exposure.md) [![Works with Apple Home](https://img.shields.io/badge/Works%20with-Apple%20Home-black?logo=apple)](docs/user-guide-apple-homepod.md) [![Works with Google Home](https://img.shields.io/badge/Works%20with-Google%20Home-blue?logo=googlehome)](docs/integrations/home-assistant.md) [![Works with Alexa](https://img.shields.io/badge/Works%20with-Alexa-blue?logo=amazon&logoColor=white&labelColor=00CAFF)](docs/integrations/home-assistant.md)
 
 > Drop into any **Home Assistant** install with one `--mqtt` flag. Or pair into **Apple Home / Google Home / Alexa / SmartThings** as a Matter Bridge. Ships 21 entities per node (11 raw signals + 10 inferred semantic states: someone-sleeping, possible-distress, room-active, elderly-inactivity-anomaly, meeting-in-progress, bathroom-occupied, fall-risk-elevated, bed-exit, no-movement, multi-room-transition) plus 3 starter HA Blueprints. See [`docs/integrations/home-assistant.md`](docs/integrations/home-assistant.md) · [ADR-115](docs/adr/ADR-115-home-assistant-integration.md).
 
@@ -607,6 +602,15 @@ Verify the plugin structure: `bash plugins/ruview/scripts/smoke.sh`. Full detail
 
 ---
 
+## 🚧 Beta software
+
+> **Beta Software** — Under active development. APIs and firmware may change. Known limitations:
+> - ESP32-C3 and original ESP32 are not supported (single-core, insufficient for CSI DSP)
+> - Single ESP32 deployments have limited spatial resolution — use 2+ nodes or add a [Cognitum Seed](https://cognitum.one) for best results
+> - Camera-free pose accuracy is limited (PCK@20 ≈ 2.5% with proxy labels) — [camera ground-truth training](docs/adr/ADR-079-camera-ground-truth-training.md) targets **35%+ PCK@20**; the pipeline is implemented, but the data-collection and evaluation phases (ADR-079 P7–P9) are still pending.
+>
+> Contributions and bug reports welcome at [Issues](https://github.com/ruvnet/RuView/issues).
+
 ## 📄 License
 
 MIT License — see [LICENSE](LICENSE) for details.