Flatten to three packages + extract mizan-runtime

packages/
  mizan-runtime/   Framework-agnostic state engine (~150 lines)
                   Context registry, batched invalidation, fetch primitives
  mizan-django/    Django server adapter (was packages/mizan-rpc/adapters/django/)
                   Codegen moved to mizan-django/generate/
  mizan-react/     React adapter (was packages/mizan-csr/adapters/react/)

Removed premature abstractions: mizan-ast, mizan-schema, mizan-rpc,
mizan-csr, mizan-ssr stub packages. The actual architecture is three
concrete packages, not five abstract layers.

mizan-runtime implements the v1 spec: registerContext with params,
scoped invalidation via microtask batching, server-driven invalidation
from mutation responses, mizanFetch for context bundles, mizanCall for
mutations.

264 Django + 33 React tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/mizan-django/generate/generator/lib/channels.mjs

@@ -0,0 +1,155 @@
+/**
+ * Channels Code Generator
+ *
+ * Generates TypeScript types and React hooks from Channels OpenAPI schema.
+ * Uses openapi-typescript for robust type generation.
+ */
+
+import openapiTS, { astToString } from 'openapi-typescript'
+
+/**
+ * Generate channels TypeScript types using openapi-typescript.
+ */
+export async function generateChannelsTypes(schema) {
+  // Generate types using openapi-typescript
+  const ast = await openapiTS(schema)
+  const typesCode = astToString(ast)
+
+  const lines = [
+    '// AUTO-GENERATED by mizan - do not edit manually',
+    '// Regenerate with: npm run schemas',
+    '',
+    '// ============================================================================',
+    '// OpenAPI Types (generated by openapi-typescript)',
+    '// ============================================================================',
+    '',
+    typesCode,
+    '',
+  ]
+
+  // Extract channel metadata from x-mizan-channels extension
+  const channels = schema['x-mizan-channels'] || []
+
+  if (channels.length > 0) {
+    lines.push('// ============================================================================')
+    lines.push('// Convenience Type Exports')
+    lines.push('// ============================================================================')
+    lines.push('')
+
+    for (const channel of channels) {
+      if (channel.hasParams) {
+        lines.push(`export type ${channel.paramsType} = components["schemas"]["${channel.paramsType}"]`)
+      }
+      if (channel.hasReactMessage) {
+        lines.push(`export type ${channel.reactMessageType} = components["schemas"]["${channel.reactMessageType}"]`)
+      }
+      if (channel.hasDjangoMessage) {
+        lines.push(`export type ${channel.djangoMessageType} = components["schemas"]["${channel.djangoMessageType}"]`)
+      }
+    }
+
+    lines.push('')
+    lines.push('// ============================================================================')
+    lines.push('// Channel Registry')
+    lines.push('// ============================================================================')
+    lines.push('')
+    lines.push('export const CHANNELS = {')
+    for (const channel of channels) {
+      lines.push(`  ${channel.name}: {`)
+      lines.push(`    name: '${channel.name}',`)
+      lines.push(`    pascalName: '${channel.pascalName}',`)
+      lines.push(`    hasParams: ${channel.hasParams},`)
+      lines.push(`    hasReactMessage: ${channel.hasReactMessage},`)
+      lines.push(`    hasDjangoMessage: ${channel.hasDjangoMessage},`)
+      if (channel.hasParams) {
+        lines.push(`    paramsType: '${channel.paramsType}',`)
+      }
+      if (channel.hasReactMessage) {
+        lines.push(`    reactMessageType: '${channel.reactMessageType}',`)
+      }
+      if (channel.hasDjangoMessage) {
+        lines.push(`    djangoMessageType: '${channel.djangoMessageType}',`)
+      }
+      lines.push(`  },`)
+    }
+    lines.push('} as const')
+  } else {
+    lines.push('export const CHANNELS = {} as const')
+  }
+
+  lines.push('')
+
+  return lines.join('\n')
+}
+
+/**
+ * Generate channel hooks from metadata.
+ */
+export function generateChannelsHooks(schema) {
+  const channels = schema['x-mizan-channels'] || []
+
+  if (channels.length === 0) {
+    return null
+  }
+
+  const lines = [
+    "'use client'",
+    '',
+    '// AUTO-GENERATED by mizan - do not edit manually',
+    '// Regenerate with: npm run schemas',
+    '',
+    "import { useChannel, type ChannelSubscription } from 'mizan/channels'",
+    '',
+  ]
+
+  // Collect type imports
+  const typeImports = []
+  for (const channel of channels) {
+    if (channel.hasParams) typeImports.push(channel.paramsType)
+    if (channel.hasReactMessage) typeImports.push(channel.reactMessageType)
+    if (channel.hasDjangoMessage) typeImports.push(channel.djangoMessageType)
+  }
+
+  if (typeImports.length > 0) {
+    lines.push(`import type { ${typeImports.join(', ')} } from './generated.channels'`)
+    lines.push('')
+  }
+
+  // Generate hooks for each channel
+  lines.push('// ============================================================================')
+  lines.push('// Channel Hooks')
+  lines.push('// ============================================================================')
+  lines.push('')
+
+  for (const channel of channels) {
+    const paramsType = channel.hasParams ? channel.paramsType : 'Record<string, never>'
+    const reactMsgType = channel.hasReactMessage ? channel.reactMessageType : 'never'
+    const djangoMsgType = channel.hasDjangoMessage ? channel.djangoMessageType : 'never'
+
+    lines.push(`/**`)
+    lines.push(` * Hook for the ${channel.name} channel.`)
+    lines.push(` */`)
+
+    if (channel.hasParams) {
+      lines.push(`export function use${channel.pascalName}Channel(params: ${paramsType}): ChannelSubscription<${paramsType}, ${djangoMsgType}, ${reactMsgType}> {`)
+      lines.push(`  return useChannel('${channel.name}', params)`)
+    } else {
+      lines.push(`export function use${channel.pascalName}Channel(): ChannelSubscription<Record<string, never>, ${djangoMsgType}, ${reactMsgType}> {`)
+      lines.push(`  return useChannel('${channel.name}', {})`)
+    }
+    lines.push('}')
+    lines.push('')
+  }
+
+  return lines.join('\n')
+}
+
+/**
+ * Generate all channels files.
+ */
+export async function generateChannelsFiles(schema) {
+  const types = await generateChannelsTypes(schema)
+  const hooks = generateChannelsHooks(schema)
+
+  return { types, hooks }
+}