feat(signup): community guidelines agreement and policies routes

Introduces /community-guidelines and /policies/{privacy,terms,[slug]} pages,
swaps the signup/invite checkbox from agreedToTerms to agreedToGuidelines,
adds Member.agreement.acceptedAt, and stamps the field when a Helcim
customer is created.

tests/server/api/validation-phase3.test.js

@@ -80,7 +80,8 @@ describe('helcimCustomerSchema', () => {
   it('accepts valid customer data', () => {
     const result = helcimCustomerSchema.safeParse({
       name: 'Jane Doe',
-      email: 'jane@example.com'
+      email: 'jane@example.com',
+      agreedToGuidelines: true
     })
     expect(result.success).toBe(true)
   })
@@ -88,7 +89,8 @@ describe('helcimCustomerSchema', () => {
   it('lowercases email', () => {
     const result = helcimCustomerSchema.safeParse({
       name: 'Jane',
-      email: 'JANE@Example.COM'
+      email: 'JANE@Example.COM',
+      agreedToGuidelines: true
     })
     expect(result.success).toBe(true)
     expect(result.data.email).toBe('jane@example.com')
@@ -97,7 +99,8 @@ describe('helcimCustomerSchema', () => {
   it('rejects invalid email', () => {
     const result = helcimCustomerSchema.safeParse({
       name: 'Jane',
-      email: 'not-an-email'
+      email: 'not-an-email',
+      agreedToGuidelines: true
     })
     expect(result.success).toBe(false)
   })
@@ -106,11 +109,29 @@ describe('helcimCustomerSchema', () => {
     const result = helcimCustomerSchema.safeParse({
       name: 'Jane',
       email: 'jane@example.com',
+      agreedToGuidelines: true,
       role: 'admin'
     })
     expect(result.success).toBe(true)
     expect(result.data).not.toHaveProperty('role')
   })
+
+  it('rejects missing agreedToGuidelines', () => {
+    const result = helcimCustomerSchema.safeParse({
+      name: 'Jane',
+      email: 'jane@example.com'
+    })
+    expect(result.success).toBe(false)
+  })
+
+  it('rejects agreedToGuidelines:false', () => {
+    const result = helcimCustomerSchema.safeParse({
+      name: 'Jane',
+      email: 'jane@example.com',
+      agreedToGuidelines: false
+    })
+    expect(result.success).toBe(false)
+  })
 })
 
 describe('helcimSubscriptionSchema', () => {
@@ -297,14 +318,16 @@ describe('seriesTicketPurchaseSchema', () => {
   it('accepts valid series ticket purchase', () => {
     const result = seriesTicketPurchaseSchema.safeParse({
       name: 'Buyer',
-      email: 'buyer@example.com'
+      email: 'buyer@example.com',
+      ticketType: 'member'
     })
     expect(result.success).toBe(true)
   })
 
   it('rejects missing name', () => {
     const result = seriesTicketPurchaseSchema.safeParse({
-      email: 'buyer@example.com'
+      email: 'buyer@example.com',
+      ticketType: 'member'
     })
     expect(result.success).toBe(false)
   })