ci(v1): pin workflow branch filters to v1/main, re-enabling the e2e gate

.github/workflows/e2e_tests.yml

@@ -1,10 +1,14 @@
 name: Playwright Tests
 
+# Pinned to `v1/main`, this branch's own base. These filters read `main`
+# historically, from when the v1 line was itself `main` — which meant they
+# matched nothing here and the suite silently never ran on this branch.
+# See #2065.
 on:
   push:
-    branches: [main]
+    branches: [v1/main]
   pull_request:
-    branches: [main]
+    branches: [v1/main]
 
 jobs:
   test:

.github/workflows/main.yml

@@ -1,9 +1,18 @@
+# `v1/main` is the deprecated maintenance line: it publishes straight from this
+# branch to the `v1-latest` dist-tag and never merges into `main`, which now
+# carries v2. Keep these filters pinned to `v1/main` — a stale `main` entry here
+# describes a topology that no longer exists, and would start matching the moment
+# anything put a v1-shaped tree back on that branch.
+#
+# (For `push`, GitHub runs the workflow file from the pushed commit, so this file
+# is only ever consulted for `v1/main` regardless. The filter states intent.)
 on:
   push:
     branches:
-      - main
       - v1/main
   pull_request:
+    branches:
+      - v1/main
   release:
     types: [published]