printedparts stage 15: print-file revision history + role-based alerts

printeditemfiles lands as the plugin's first incremental migration
(0002 on the plugin chain - the ADR-008 payoff). Revisions are
append-only per item: upload assigns the next number, records the
uploader from the JWT, enforces an extension allowlist and a 100 MB
cap; download serves the original filename; a permission-gated delete
covers wrong-file mistakes. The detail page gains the revision table
with a current badge. Unique storedfilename is sized 191 so the index
fits MySQL's 767-byte prefix - the per-plugin chain does not apply the
core env's ROW_FORMAT hook.

Alert recipients gain roles: Role joins the 0.13.0 surface, a role
picker on the settings page, and every active member of the selected
roles is folded into the deduped recipient list.

tests/test_plugins/test_printedparts_ledger.py

@@ -260,3 +260,69 @@ def test_retire_hides_and_restore_returns(client, auth_headers, item):
     assert client.post(f'/api/printedparts/items/{item}/restore',
                        headers=auth_headers).status_code == 200
     assert client.get('/api/printedparts/kiosk/item/3DP-9001').status_code == 200
+
+
+def test_file_revisions_append_and_download(client, auth_headers, item, tmp_path):
+    """Uploads mint sequential revisions; download returns the original name."""
+    import io
+
+    first = client.post(f'/api/printedparts/items/{item}/files',
+                        data={'file': (io.BytesIO(b'solid part'), 'clip_v1.stl'),
+                              'note': 'initial'},
+                        headers=auth_headers,
+                        content_type='multipart/form-data')
+    assert first.status_code == 201, first.get_json()
+    assert first.get_json()['data']['revision'] == 1
+
+    second = client.post(f'/api/printedparts/items/{item}/files',
+                         data={'file': (io.BytesIO(b'G1 X0 Y0'), 'clip_v2.gcode')},
+                         headers=auth_headers,
+                         content_type='multipart/form-data')
+    assert second.get_json()['data']['revision'] == 2
+
+    bad = client.post(f'/api/printedparts/items/{item}/files',
+                      data={'file': (io.BytesIO(b'x'), 'malware.exe')},
+                      headers=auth_headers,
+                      content_type='multipart/form-data')
+    assert bad.status_code == 400
+
+    listing = client.get(f'/api/printedparts/items/{item}/files').get_json()['data']
+    assert [f['revision'] for f in listing] == [2, 1]
+
+    fileid = listing[1]['fileid']
+    download = client.get(f'/api/printedparts/files/{fileid}/download')
+    assert download.status_code == 200
+    assert download.data == b'solid part'
+    assert 'clip_v1.stl' in download.headers['Content-Disposition']
+
+
+def test_alert_role_members_receive(client, auth_headers, app, item,
+                                    directory_employee, monkeypatch):
+    """Every active member of a selected role gets the alert."""
+    import shopdb.api as contract_surface
+    captured = {}
+    monkeypatch.setattr(contract_surface, 'send_email',
+                        lambda to, subject, html, text=None:
+                        captured.setdefault('to', to) or True)
+
+    with app.app_context():
+        from shopdb.api import User, Role
+        from werkzeug.security import generate_password_hash
+        role = Role(rolename='partscrew', description='3D parts crew')
+        member = User(username='crewone', email='crewone@site.test',
+                      passwordhash=generate_password_hash('x'), isactive=True)
+        member.roles.append(role)
+        db.session.add_all([role, member])
+        db.session.commit()
+        Setting.set('printedparts_alert_roleids', str(role.roleid),
+                    valuetype='string', category='printedparts')
+        db.session.commit()
+
+    client.post(f'/api/printedparts/items/{item}/restock',
+                json={'quantity': 10, 'badge': directory_employee},
+                headers=auth_headers)
+    take = client.post('/api/printedparts/kiosk/take',
+                       json={'itemcode': '3DP-9001',
+                             'badge': directory_employee, 'quantity': 6})
+    assert take.status_code == 200
+    assert captured['to'] == ['crewone@site.test']