Pin baselines from data/baselines/ + bump test count to 325

Production /evals showed 'Not pinned' for all three cards because
tests/ was excluded by .dockerignore. Fix by copying baselines into
a runtime-stable data/baselines/ directory and reading from there first.
Also update the stale '268 tests passing' on landing to 325.

Author: Sathwik Arroju

.dockerignore

@@ -45,9 +45,13 @@ architecture.png
 *.md
 !README.md
 
-# Tests aren't needed in the runtime image.
+# Tests aren't needed in the runtime image…
 tests/
 pytest.ini
+# …but keep the pinned eval-baseline JSONs — the running app reads these
+# at /evals and on the landing page (the dual-baseline ribbon).
+!tests/fixtures/
+!tests/fixtures/*.json
 
 # Tooling.
 docker-compose.override.yml