Split draft-spec scenarios into their own suite (#317)

* feat: split draft-spec scenarios into their own suite

- add --suite draft to the server command, selecting scenarios whose
  source.introducedIn is the draft protocol version
- exclude draft scenarios from the default active suite until the draft
  spec is published as a dated release
- derive the client command's draft suite from source.introducedIn so the
  non-auth draft scenarios (SEP-2243/2575/2322/2106) are included alongside
  the auth ones
- keep everything-server self-test coverage for draft scenarios in
  all-scenarios.test.ts (active + non-pending draft)
- document available suites in the README and add suite-membership tests

* fix: repair broken specReferences URLs

- SEP-986: SEP/SEP-986.md no longer exists in the spec repo; point at the
  Tool Names section of the published 2025-11-25 tools page instead
- SEP-990: the ext-auth spec file is enterprise-managed-authorization.mdx,
  not enterprise-oauth.mdx

Fixes #313

vitest.config.ts

@@ -5,7 +5,15 @@ export default defineConfig({
     globals: true,
     environment: 'node',
     include: ['**/*.test.ts'],
-    exclude: ['**/node_modules/**', 'dist', '.sdk-under-test'],
+    exclude: [
+      '**/node_modules/**',
+      'dist',
+      '.sdk-under-test',
+      // Local tooling workspaces (Claude worktrees, SDK checkouts) must never
+      // be collected as test files.
+      '**/.claude/**',
+      '**/.sdk-under-test/**'
+    ],
     // Run test files sequentially to avoid port conflicts
     fileParallelism: false,
     // Increase timeout for server tests in CI