chore: stable spec release 2026-01-26 and SDK v1.0.0 (#362)

* chore: add stable spec release 2026-01-26

- Use git mv to copy specification from draft to specification/2026-01-26/apps.mdx (preserves history)
- Update status from 'Draft' to 'Stable (2026-01-26)'
- Add specification version table to README
- Update Resources section with links to both stable and draft specs

* chore: bump version to 1.0.0

- Update main package version from 0.4.2 to 1.0.0
- Update all example package versions to 1.0.0
- Regenerate package-lock.json

* prettier

* chore: align protocol version with spec release 2026-01-26

- Add 'Protocol Version: 2026-01-26' to spec header
- Update LATEST_PROTOCOL_VERSION from '2025-11-21' to '2026-01-26'
- Update spec examples to use '2026-01-26' protocol version
- Add '2025-11-21' to SUPPORTED_PROTOCOL_VERSIONS for backwards compatibility

* chore: update spec references to stable 2026-01-26

- Update typedoc.config.mjs navigation link
- Update docs/overview.md spec links (10 occurrences)
- Update plugins/mcp-apps/skills/create-mcp-app/SKILL.md spec link
- Update src/spec.types.ts @see links
- Update AGENTS.md spec path
- Regenerate src/generated/schema.ts with updated links

* chore: simplify versioning - first stable release

- Remove backwards compatibility version (2025-11-21) - this is the first stable release
- Remove redundant 'Protocol Version' header - spec version IS the protocol version

* chore: add history reference comment to stable spec

src/generated/schema.ts

@@ -178,7 +178,7 @@ export const McpUiMessageResultSchema = z
 /**
  * @description Notification that the sandbox proxy iframe is ready to receive content.
  * @internal
- * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx#sandbox-proxy
+ * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx#sandbox-proxy
  */
 export const McpUiSandboxProxyReadyNotificationSchema = z.object({
   method: z.literal("ui/notifications/sandbox-proxy-ready"),
@@ -608,7 +608,7 @@ export const McpUiMessageRequestSchema = z.object({
 /**
  * @description Notification containing HTML resource for the sandbox proxy to load.
  * @internal
- * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx#sandbox-proxy
+ * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx#sandbox-proxy
  */
 export const McpUiSandboxResourceReadyNotificationSchema = z.object({
   method: z.literal("ui/notifications/sandbox-resource-ready"),

src/spec.types.ts

@@ -7,7 +7,7 @@
  * - Use `@description` JSDoc tags to generate `.describe()` calls on schemas
  * - Run `npm run generate:schemas` to regenerate schemas from these types
  *
- * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx
+ * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx
  */
 
 import type {
@@ -24,7 +24,7 @@ import type {
  * The SDK automatically handles version negotiation during initialization.
  * Apps and hosts don't need to manage protocol versions manually.
  */
-export const LATEST_PROTOCOL_VERSION = "2025-11-21";
+export const LATEST_PROTOCOL_VERSION = "2026-01-26";
 
 /**
  * @description Color theme preference for the host environment.
@@ -199,7 +199,7 @@ export interface McpUiMessageResult {
 /**
  * @description Notification that the sandbox proxy iframe is ready to receive content.
  * @internal
- * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx#sandbox-proxy
+ * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx#sandbox-proxy
  */
 export interface McpUiSandboxProxyReadyNotification {
   method: "ui/notifications/sandbox-proxy-ready";
@@ -209,7 +209,7 @@ export interface McpUiSandboxProxyReadyNotification {
 /**
  * @description Notification containing HTML resource for the sandbox proxy to load.
  * @internal
- * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx#sandbox-proxy
+ * @see https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx#sandbox-proxy
  */
 export interface McpUiSandboxResourceReadyNotification {
   method: "ui/notifications/sandbox-resource-ready";