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_roster.py

@@ -74,6 +74,28 @@ def test_sync_skips_inactive_members(db_session):
     assert db_session.query(models.Student).count() == 1
 
 
+def test_sync_extracts_pronouns_from_nrps_message(db_session):
+    course = make_course(db_session)
+    custom_claim = "https://purl.imsglobal.org/spec/lti/claim/custom"
+    sync_roster(
+        db_session,
+        course,
+        [
+            member("u1", message=[{custom_claim: {"pronouns": "they/them"}}]),
+            # Unexpanded variable (platform without pronouns) is ignored.
+            member(
+                "u2",
+                message=[{custom_claim: {"pronouns": "$com.instructure.Person.pronouns"}}],
+            ),
+        ],
+    )
+    students = {
+        s.canvas_user_id: s for s in db_session.query(models.Student).all()
+    }
+    assert students["u1"].pronouns == "they/them"
+    assert students["u2"].pronouns is None
+
+
 def test_sync_updates_changed_names(db_session):
     course = make_course(db_session)
     sync_roster(db_session, course, [member("u1", "Old Name")])