Harden challenge quality gates, consistency checks, and student support docs

.github/ISSUE_TEMPLATE/config.yml

@@ -1,6 +1,6 @@
 blank_issues_enabled: true
 contact_links:
-  - name: "Register for GIT Going with GitHub (March 7-8, 2026)"
+  - name: "Register for GIT Going with GitHub (May 21-22, 2026)"
     url: https://community-access.github.io/git-going-with-github/REGISTER.html
     about: Two-step registration (GitHub issue + Zoom). Free, online, 75 seats.
   - name: GitHub Skills - Introduction to GitHub

.github/ISSUE_TEMPLATE/feedback-workshop.yml

@@ -1,6 +1,6 @@
 name: "Workshop Feedback - Constructive Input Welcomed"
 description: "Share your experience with GIT Going with GitHub - what worked, what didn't, what you learned, what confused you. Your feedback helps us improve for the next cohort."
-title: "[FEEDBACK] GIT Going with GitHub - March 2026"
+title: "[FEEDBACK] GIT Going with GitHub - [WORKSHOP_DATE]"
 labels: ["feedback", "workshop-experience"]
 assignees: []
 body:

.github/ISSUE_TEMPLATE/workshop-registration.yml

@@ -1,6 +1,6 @@
 name: "Workshop Registration - GIT Going with GitHub"
-description: "Register for the GIT Going with GitHub workshop (March 7-8, 2026)"
-title: "[REGISTER] GIT Going with GitHub - March 2026"
+description: "Register for the GIT Going with GitHub workshop ([WORKSHOP_DATE_DAY1] and [WORKSHOP_DATE_DAY2])"
+title: "[REGISTER] GIT Going with GitHub - [WORKSHOP_DATE]"
 labels: ["registration"]
 assignees: []
 body:
@@ -9,8 +9,8 @@ body:
       value: |
         ## Welcome! You are registering for GIT Going with GitHub.
 
-        **Dates:** Saturday, March 7 and Sunday, March 8, 2026
-        **Time:** 12:00 PM - 8:00 PM Eastern (both days)
+        **Dates:** [WORKSHOP_DATE_DAY1] and [WORKSHOP_DATE_DAY2]
+        **Time:** [WORKSHOP_TIME] (both days)
         **Cost:** Free
         **Capacity:** 75 participants