Rename project to butterfly-edfa-rack; broaden descriptions beyond Koheron

The repo bridges both instruments (Koheron CTL200 seed + Agiltron M511
EDFA), so 'koheron-esp32-bridge' was too narrow. Align the repo name and
descriptions to the identifier the whole stack already uses
(butterfly_edfa_rack): README title, Makefile/platformio headers, and the
homeassistant/ copies. Device id, MQTT topics and entity ids are
unchanged, so no reflash or lost HA history. Sibling HA repo renamed to
butterfly-edfa-rack-homeassistant.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

homeassistant/README.md

@@ -28,7 +28,7 @@ ssh $host 'docker exec homeassistant python -m homeassistant --script check_conf
 ssh $host 'docker restart homeassistant'
 ```
 
-The dashboard reloads on browser refresh; changes to `configuration.yaml`/`scripts.yaml` need the restart. The dashboard appears in the sidebar as **Butterfly Rack** (`/butterfly-rack`).
+The dashboard reloads on browser refresh; changes to `configuration.yaml`/`scripts.yaml` need the restart. The dashboard appears in the sidebar as **Butterfly EDFA Rack** (`/butterfly-rack`).
 
 ## Notes
 

homeassistant/configuration.snippet.yaml

@@ -49,7 +49,7 @@ lovelace:
   dashboards:
     butterfly-rack:
       mode: yaml
-      title: Butterfly Rack
+      title: Butterfly EDFA Rack
       icon: mdi:laser-pointer
       show_in_sidebar: true
       filename: ui-lovelace-butterfly.yaml

homeassistant/ui-lovelace-butterfly.yaml

@@ -10,7 +10,7 @@
 #                           stages, emergency stop. Everything you touch.
 #   Diagnostics & Trends  — the history graphs plus network / TEC / error
 #                           detail, kept off the control tab so it stays clean.
-title: Butterfly Rack
+title: Butterfly EDFA Rack
 views:
   # ===================================================================
   # TAB 1 — CONTROL PANEL