CI: flush stale ./cf-access / ./schema.sql exports from the dist branch (one publish)

npm-dist deep-merges source `exports` into the dist branch's package.json, so
removed keys survive; a non-empty `exports_map` makes it drop exports whose
files are missing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DyJyzSYpRxJuL6x6NyjpG3

Author: ryan-williams

.github/workflows/ci.yml

@@ -49,6 +49,10 @@ jobs:
           # file list, which silently drops any migration added after it;
           # `verify-dist` fails the publish if the shipped set diverges from source.
           extra_files: migrations,README.md
+          # One publish only: the dist branch's package.json still carries
+          # `./cf-access` and `./schema.sql` (npm-dist deep-merges `exports`), and
+          # a non-empty exports_map makes it drop entries whose files are gone.
+          exports_map: '{}'
 
   # Install the published branch exactly as a consumer would, and use it.
   # The `test` job runs against `src/`, which says nothing about whether the