test(conformance): add expected-failures baseline for unimplemented scenarios

Conformance 0.1.15 added three scenarios the v2 SDK doesn't implement yet:
- client: auth/pre-registration (OAuth without DCR)
- client: auth/cross-app-access-complete-flow (SEP-990)
- server: dns-rebinding-protection

Baseline them via --expected-failures so CI exits 0 on expected failures,
1 on regressions or stale entries (scenario starts passing → must update file).

Author: felixweinberger

test/conformance/expected-failures.yaml

@@ -0,0 +1,9 @@
+# Conformance scenarios not yet implemented in the v2 TypeScript SDK.
+# CI exits 0 if only these fail, exits 1 on unexpected failures or stale entries.
+
+client:
+    - auth/pre-registration
+    - auth/cross-app-access-complete-flow
+
+server:
+    - dns-rebinding-protection

test/conformance/package.json

@@ -28,11 +28,11 @@
         "start": "npm run server",
         "server": "tsx watch --clear-screen=false scripts/cli.ts server",
         "client": "tsx scripts/cli.ts client",
-        "test:conformance:client": "conformance client --command 'npx tsx ./src/everythingClient.ts'",
-        "test:conformance:client:all": "conformance client --command 'npx tsx ./src/everythingClient.ts' --suite all",
+        "test:conformance:client": "conformance client --command 'npx tsx ./src/everythingClient.ts' --expected-failures ./expected-failures.yaml",
+        "test:conformance:client:all": "conformance client --command 'npx tsx ./src/everythingClient.ts' --suite all --expected-failures ./expected-failures.yaml",
         "test:conformance:client:run": "npx tsx ./src/everythingClient.ts",
-        "test:conformance:server": "scripts/run-server-conformance.sh",
-        "test:conformance:server:all": "scripts/run-server-conformance.sh --suite all",
+        "test:conformance:server": "scripts/run-server-conformance.sh --expected-failures ./expected-failures.yaml",
+        "test:conformance:server:all": "scripts/run-server-conformance.sh --suite all --expected-failures ./expected-failures.yaml",
         "test:conformance:server:run": "npx tsx ./src/everythingServer.ts",
         "test:conformance:all": "pnpm run test:conformance:client:all && pnpm run test:conformance:server:all"
     },