Revert "ci(lint): skip remote config schema verification"

This reverts commit d7d8dd25.

The lint job failed on a transient timeout fetching the golangci-lint
config schema, which is a CI infrastructure concern rather than a defect
in this change. Disabling schema verification to work around it does not
belong in a cache-hardening PR: it weakens a check for every future run,
and its root cause is out of scope here. Leaving CI configuration
untouched keeps this PR to the lockdown cache redesign.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

.github/workflows/lint.yml

@@ -24,8 +24,3 @@ jobs:
         with:
           # sync with script/lint
           version: v2.9
-          # The action's config verification downloads a JSON schema from
-          # golangci-lint.run on every run, so a blip reaching that host fails
-          # the job before any linter runs. Skip it: linting must depend only
-          # on the checked-out code, and script/lint does not verify either.
-          verify: false