First cut

shared/package.json

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+{
+  "name": "@dynamic-sites/shared",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts",
+    "./*": "./src/*"
+  },
+  "dependencies": {
+    "zod": "^3.24.0"
+  }
+}

shared/src/canonical-json.ts

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+/**
+ * Canonical JSON serialization: sorted keys at every level, 2-space indent, trailing newline.
+ */
+
+export type JsonPrimitive = string | number | boolean | null;
+export type JsonValue = JsonPrimitive | JsonValue[] | { [key: string]: JsonValue };
+
+function sortKeys(value: unknown): unknown {
+  if (value === null || typeof value !== 'object') return value;
+  if (Array.isArray(value)) return value.map(sortKeys);
+  const sorted: Record<string, unknown> = {};
+  for (const key of Object.keys(value as Record<string, unknown>).sort()) {
+    sorted[key] = sortKeys((value as Record<string, unknown>)[key]);
+  }
+  return sorted;
+}
+
+export function stringifyCanonical(value: unknown): string {
+  return JSON.stringify(sortKeys(value), null, 2) + '\n';
+}

shared/src/index.ts

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+export { stringifyCanonical, type JsonValue, type JsonPrimitive } from './canonical-json.js';
+export * from './schemas/index.js';
+export {
+  schemaForRepoRelativePath,
+  isEditableContentRepoPath,
+  parseAndValidateRepoJson,
+} from './repo-validation.js';

shared/src/repo-validation.ts

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+import { z } from 'zod';
+import {
+  siteContextSchema,
+  sectionFileSchema,
+  eventsFileSchema,
+  smsSitesConfigSchema,
+} from './schemas/index.js';
+
+const EDITABLE_PATTERNS: Array<{ pattern: RegExp; schema: z.ZodTypeAny }> = [
+  { pattern: /^content\/sections\/[^/]+\.json$/, schema: sectionFileSchema },
+  { pattern: /^content\/events\.json$/, schema: eventsFileSchema },
+  { pattern: /^site-context\.json$/, schema: siteContextSchema },
+  { pattern: /^config\/sms-sites\.json$/, schema: smsSitesConfigSchema },
+];
+
+export function schemaForRepoRelativePath(relativePath: string): z.ZodTypeAny | null {
+  for (const { pattern, schema } of EDITABLE_PATTERNS) {
+    if (pattern.test(relativePath)) return schema;
+  }
+  return null;
+}
+
+export function isEditableContentRepoPath(relativePath: string): boolean {
+  return EDITABLE_PATTERNS.some(({ pattern }) => pattern.test(relativePath));
+}
+
+export function parseAndValidateRepoJson(
+  repoRelativePath: string,
+  rawText: string
+): { success: true; data: unknown } | { success: false; error: string } {
+  const schema = schemaForRepoRelativePath(repoRelativePath);
+  if (!schema) return { success: false, error: `No schema found for path: ${repoRelativePath}` };
+
+  try {
+    const parsed = JSON.parse(rawText);
+    const result = schema.safeParse(parsed);
+    if (result.success) return { success: true, data: result.data };
+    return { success: false, error: result.error.issues.map(i => `${i.path.join('.')}: ${i.message}`).join('; ') };
+  } catch (e) {
+    return { success: false, error: `Invalid JSON: ${(e as Error).message}` };
+  }
+}

shared/src/schemas/index.ts

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+import { z } from 'zod';
+
+// ── Site Context ──
+export const siteContextSchema = z.object({
+  businessName: z.string(),
+  tagline: z.string().optional(),
+  tone: z.string().default('professional and friendly'),
+  style: z.string().optional(),
+  promptContext: z.string().optional(),
+  primaryColor: z.string().optional(),
+  contactEmail: z.string().email().optional(),
+  contactPhone: z.string().optional(),
+  address: z.string().optional(),
+});
+export type SiteContext = z.infer<typeof siteContextSchema>;
+
+// ── Section File (union of section types) ──
+const baseSectionFields = {
+  id: z.string(),
+  order: z.number().int().default(0),
+  visible: z.boolean().default(true),
+  image: z.string().optional(),
+};
+
+export const heroSectionSchema = z.object({
+  ...baseSectionFields,
+  type: z.literal('hero'),
+  headline: z.string(),
+  subheading: z.string().optional(),
+  ctaText: z.string().optional(),
+  ctaLink: z.string().optional(),
+});
+
+export const aboutSectionSchema = z.object({
+  ...baseSectionFields,
+  type: z.literal('about'),
+  title: z.string().default('About Us'),
+  content: z.string(),
+});
+
+export const featureItemSchema = z.object({
+  title: z.string(),
+  description: z.string(),
+  icon: z.string().optional(),
+});
+
+export const featuresSectionSchema = z.object({
+  ...baseSectionFields,
+  type: z.literal('features'),
+  title: z.string().default('What We Offer'),
+  items: z.array(featureItemSchema).min(1),
+});
+
+export const testimonialItemSchema = z.object({
+  quote: z.string(),
+  author: z.string(),
+  role: z.string().optional(),
+});
+
+export const testimonialsSectionSchema = z.object({
+  ...baseSectionFields,
+  type: z.literal('testimonials'),
+  title: z.string().default('What Our Clients Say'),
+  items: z.array(testimonialItemSchema).min(1),
+});
+
+export const textSectionSchema = z.object({
+  ...baseSectionFields,
+  type: z.literal('text'),
+  heading: z.string().optional(),
+  content: z.string(),
+});
+
+export const sectionFileSchema = z.discriminatedUnion('type', [
+  heroSectionSchema,
+  aboutSectionSchema,
+  featuresSectionSchema,
+  testimonialsSectionSchema,
+  textSectionSchema,
+]);
+export type SectionFile = z.infer<typeof sectionFileSchema>;
+
+// ── Events ──
+export const eventItemSchema = z.object({
+  id: z.string(),
+  title: z.string(),
+  description: z.string().optional(),
+  date: z.string(),
+  time: z.string().optional(),
+  location: z.string().optional(),
+});
+
+export const eventsFileSchema = z.object({
+  events: z.array(eventItemSchema),
+});
+export type EventsFile = z.infer<typeof eventsFileSchema>;
+
+// ── SMS Sites Config ──
+export const smsSiteEntrySchema = z.object({
+  siteId: z.string(),
+  phoneNumber: z.string(),
+  allowedSenders: z.array(z.string()),
+  repoRoot: z.string().optional(),
+});
+
+export const smsSitesConfigSchema = z.object({
+  sites: z.array(smsSiteEntrySchema),
+});
+export type SmsSitesConfig = z.infer<typeof smsSitesConfigSchema>;
+
+// ── Edit Request ──
+export const editRequestSchema = z.object({
+  message: z.string().min(1),
+  repo_relative_path: z.string().optional(),
+  proposal_id: z.string().optional(),
+  confirm: z.enum(['yes', 'no']).optional(),
+});
+export type EditRequest = z.infer<typeof editRequestSchema>;
+
+export const editJobPayloadSchema = z.discriminatedUnion('kind', [
+  z.object({
+    kind: z.literal('propose'),
+    id: z.string(),
+    message: z.string(),
+    repo_relative_path: z.string().optional(),
+    source: z.enum(['sms', 'http', 'editor']).default('http'),
+    smsReplyMeta: z.object({
+      from: z.string(),
+      to: z.string(),
+    }).optional(),
+  }),
+  z.object({
+    kind: z.literal('apply'),
+    id: z.string(),
+    proposal_id: z.string(),
+    source: z.enum(['sms', 'http', 'editor']).default('http'),
+    smsReplyMeta: z.object({
+      from: z.string(),
+      to: z.string(),
+    }).optional(),
+  }),
+]);
+export type EditJobPayload = z.infer<typeof editJobPayloadSchema>;
+
+// ── Routing output (LLM structured output) ──
+export const routingOutputSchema = z.object({
+  repo_relative_path: z.string(),
+  needs_clarification: z.boolean().default(false),
+  reason: z.string(),
+  clarification_message: z.string().optional(),
+});
+export type RoutingOutput = z.infer<typeof routingOutputSchema>;