Add RowdyHacks XII (opens soon; applications not open)

[ChimdumebiNebolisa]

Summary

• Add RowdyHacks XII as opens_soon
• Homepage shows Register, but /register runtime says registration is currently closed (registrationAvailable: false)

Closes #160

Evidence

• https://rowdyhacks.org/register — “Registration Is Currently Closed”
• Bundled config registrationAvailable:!1

Test plan

• Listing state=opens_soon

[Jose-Gael-Cruz-Lopez]

Synced with main and corrected state from open to opens_soon.

rowdyhacks.org/register currently returns:

Registration Is Currently Closed — This operation is currently closed to new team members.

Read as pre-launch rather than a finished cycle: the schedule still says "Schedule still in progress...", the footer reads "© RowdyHacks & ACM at UTSA 2026", and the site carries the MLH 2027-season badge. Nothing indicates a completed event.

Retitled to RowdyHacks XII (Student Hackathon; Applications Not Yet Open) — the previous title said "Registration Open", which contradicted the site.

⚠️ Note for later: the FAQ ships an unfilled template placeholder, verbatim "The deadline for registration is <Date>, at 23:59." — no deadline should be recorded until that resolves to a real date.