chore: populate roster, align CSV workflow, clean up cruft

- Populate student-roster.json with 72 registrants (non-PII fields only)
- Update registration workflow CSV to match registration-data.csv format
- Add OrgStatus column (member/pending/needs-invite) to CSV export
- Add org members: read permission for membership check
- Rename CSV artifact to registration-data
- Add progress-tracker-template.json
- Remove addmissing.bat and wxpython-specialist-original.md from tracking
- Extend .gitignore for remaining admin artifacts

Author: GitHub Workshop Bot

.github/data/progress-tracker-template.json

@@ -0,0 +1,43 @@
+{
+  "workshop_metadata": {
+    "start_date": "2026-03-08T12:00:00-05:00",
+    "end_date": "2026-03-09T20:00:00-05:00",
+    "total_students": 66,
+    "facilitators": ["lead_facilitator_username"],
+    "status": "scheduled"
+  },
+  "progress": {
+    "total_prs_opened": 0,
+    "total_prs_merged": 0,
+    "students_with_first_pr": 0,
+    "students_with_merged_pr": 0,
+    "students_completed": 0,
+    "total_reviews_completed": 0,
+    "average_pr_completion_time_minutes": 0
+  },
+  "student_progress_template": {
+    "username": "required_field",
+    "assigned_issue": null,
+    "issue_number": null,
+    "pr_opened": false,
+    "pr_opened_timestamp": null,
+    "pr_merged": false,
+    "pr_merged_timestamp": null,
+    "reviews_completed": 0,
+    "feedback_received": 0,
+    "status": "not_started",
+    "notes": "For facilitator observations",
+    "help_requests": []
+  },
+  "status_legend": {
+    "not_started": "Student not yet engaged",
+    "assigned": "Issue assigned, waiting to start",
+    "in_progress": "Working on challenge",
+    "pr_open": "PR opened, awaiting review",
+    "review_in_progress": "Peer reviewing others' work",
+    "merged": "First PR merged - milestone achieved!",
+    "advanced": "Working on harder challenges",
+    "completed": "Finished all goals for day"
+  },
+  "note": "This template will be populated by facilitators and automated scripts during the workshop. See facilitator guide for how to update this file."
+}