ci: a runner label names the platform, not the org

hanzo-build-linux-amd64, lux-build-linux-amd64, zoo-build-linux-amd64 and
every other org-prefixed spelling all meant the same machine. Which org a
job belongs to does not change which host can build it, so the org bought
one pool name per org per arch and each could go stale on its own -- the
evo host alone answered to fourteen names for one label.

One vocabulary now: linux-amd64, linux-arm64, macos-arm64, win-amd64. The
generic labels every plain workflow uses (ubuntu-latest, self-hosted) are
untouched, so naive CI keeps working.

Co-authored-by: Hanzo Dev <[email protected]>

.hanzo/workflows/ci.yml

@@ -30,7 +30,7 @@ env:
 
 jobs:
   test:
-    runs-on: [lux-build-linux-amd64]
+    runs-on: [linux-amd64]
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
@@ -43,7 +43,7 @@ jobs:
       - run: go test -count=1 -short -timeout 300s ./...
 
   govulncheck:
-    runs-on: [lux-build-linux-amd64]
+    runs-on: [linux-amd64]
     timeout-minutes: 20
     steps:
       - uses: actions/checkout@v4