Phase 5: reporting, exports, pronouns, and roster freshness

Instructor participation report: per-student histograms, outcome mix
by class day, and a sortable table including the fairness ratio
(answered calls over questions present for, with opt-out days out of
the denominator), plus CSV exports of students, calls, and opt-outs.

Assessment scales are now per-course data: ordered levels with labels
and points out of 100 (defaults carry the old R grading values), with
calls referencing levels by id so renames follow through to history.
Renaming, re-pointing, reordering, and adding levels are always
allowed; deleting a level in use by recorded calls is blocked.

Pronouns and course term dates come from Canvas custom variable
substitutions, at launch and roster-wide via rlid-scoped NRPS; the
student page notes that names/pronouns are Canvas-sourced. Rosters
can also be refreshed outside launches: a "Sync roster now" button
and a sync-rosters CLI command for an hourly cron job, skipping ended
courses. Alembic now runs SQLite-compatible batch migrations with a
constraint naming convention.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_cli.py

@@ -0,0 +1,30 @@
+import datetime
+
+from sqlalchemy import select
+
+from coldcall_lti.models import Course
+from conftest import make_app
+
+
+def test_sync_rosters_skips_unsyncable_and_ended_courses(tmp_path):
+    app = make_app(tmp_path, dev_mode=True)
+    client = app.test_client()
+    client.post("/dev/launch/dev-instructor")  # creates the dev course
+
+    with app.app_context():
+        db = app.extensions["db_session_factory"]()
+        ended = Course(
+            lti_context_id="old-course",
+            title="Old Course",
+            nrps_url="https://example.edu/nrps",
+            end_date=datetime.date.today() - datetime.timedelta(days=90),
+        )
+        db.add(ended)
+        db.commit()
+        db.close()
+
+    result = app.test_cli_runner().invoke(args=["sync-rosters"])
+    assert result.exit_code == 0
+    # The dev course has no NRPS service; the old course has ended.
+    assert "no roster service recorded, skipped" in result.output
+    assert "Old Course: ended, skipped" in result.output