Add cyber as a community skin

Introduce the cyber skin under tokens/community/cyber.json. Brands placed
in tokens/community/ are surfaced in Figma with a "(Community)" suffix on
their Brand-collection mode name (e.g. "Cyber (Community)").

- Discover tokens/community/*.json in the Figma sync (index.mjs) and the
  linter (index.js), deriving the brand key from the file basename so the
  community/ prefix does not leak into the key.
- Mark community brands via COMMUNITY_BRANDS and append the suffix in
  format-brand-name.mjs.
- Register cyber across BRAND_KEY, FONT_FAMILIES (Telefonica Sans),
  ICON_SETS (Default) and BRAND_NAMES (Cyber).
- Add the cyber palette patterns to the skin schema and validate
  community/cyber.json in the schema-validator workflow; trigger the
  sync workflow on changes to the file.
- Add the neutral button-link and text-link color tokens (light and dark)
  that cyber was missing relative to the other skins.

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

Author: aweell

.github/workflows/schema-validator.yml

@@ -29,6 +29,7 @@ jobs:
             telefonica,
             blau,
             esimflag,
+            community/cyber,
           ]
       fail-fast: false
 

.github/workflows/sync-figma-tokens.yml

@@ -14,6 +14,7 @@ on:
       - "tokens/blau.json"
       - "tokens/tu.json"
       - "tokens/esimflag.json"
+      - "tokens/community/cyber.json"
 
 permissions:
   contents: read