test: check if code is API breaking

.github/workflows/api_contract.yml

@@ -0,0 +1,26 @@
+name: API Contract
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+  merge_group:
+
+permissions:
+  contents: read
+
+jobs:
+  api-contract:
+    name: Check public API route contract
+    runs-on: ubuntu-latest
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+      cancel-in-progress: true
+    steps:
+      - uses: actions/checkout@v5
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+      - name: Verify public API contract
+        run: python test/test_api_contract.py

test/api_contract_manifest.json

@@ -0,0 +1,74 @@
+{
+  "version": 1,
+  "description": "Public Lemonade API route contract. CI compares this manifest with the C++ route registrations so accidental method or path removals are caught during review.",
+  "sources": [
+    "src/cpp/server/server.cpp",
+    "src/cpp/server/ollama_api.cpp",
+    "src/cpp/server/anthropic_api.cpp",
+    "src/cpp/server/websocket_server.cpp"
+  ],
+  "versioned_prefixes": [
+    "/api/v0",
+    "/api/v1",
+    "/v0",
+    "/v1"
+  ],
+  "http_routes": [
+    {"method": "GET", "path": "/live"},
+    {"method": "GET", "path": "/metrics"},
+
+    {"method": "GET", "versioned_path": "health"},
+    {"method": "GET", "versioned_path": "models"},
+    {"method": "GET", "versioned_path": "models/{param}"},
+    {"method": "GET", "versioned_path": "slots"},
+    {"method": "GET", "versioned_path": "pull/variants"},
+    {"method": "GET", "versioned_path": "downloads"},
+    {"method": "GET", "versioned_path": "stats"},
+    {"method": "GET", "versioned_path": "system-info"},
+    {"method": "GET", "versioned_path": "system-stats"},
+
+    {"method": "POST", "versioned_path": "chat/completions"},
+    {"method": "POST", "versioned_path": "completions"},
+    {"method": "POST", "versioned_path": "embeddings"},
+    {"method": "POST", "versioned_path": "reranking"},
+    {"method": "POST", "versioned_path": "slots/{param}"},
+    {"method": "POST", "versioned_path": "tokenize"},
+    {"method": "POST", "versioned_path": "audio/transcriptions"},
+    {"method": "POST", "versioned_path": "audio/speech"},
+    {"method": "POST", "versioned_path": "images/generations"},
+    {"method": "POST", "versioned_path": "images/edits"},
+    {"method": "POST", "versioned_path": "images/variations"},
+    {"method": "POST", "versioned_path": "images/upscale"},
+    {"method": "POST", "versioned_path": "responses"},
+    {"method": "POST", "versioned_path": "pull"},
+    {"method": "POST", "versioned_path": "downloads/control"},
+    {"method": "POST", "versioned_path": "load"},
+    {"method": "POST", "versioned_path": "unload"},
+    {"method": "POST", "versioned_path": "delete"},
+    {"method": "POST", "versioned_path": "params"},
+    {"method": "POST", "versioned_path": "install"},
+    {"method": "POST", "versioned_path": "uninstall"},
+    {"method": "POST", "versioned_path": "log-level"},
+
+    {"method": "POST", "path": "/api/chat"},
+    {"method": "POST", "path": "/api/generate"},
+    {"method": "GET", "path": "/api/tags"},
+    {"method": "POST", "path": "/api/show"},
+    {"method": "DELETE", "path": "/api/delete"},
+    {"method": "POST", "path": "/api/pull"},
+    {"method": "POST", "path": "/api/embed"},
+    {"method": "POST", "path": "/api/embeddings"},
+    {"method": "GET", "path": "/api/ps"},
+    {"method": "GET", "path": "/api/version"},
+    {"method": "POST", "path": "/api/create"},
+    {"method": "POST", "path": "/api/copy"},
+    {"method": "POST", "path": "/api/push"},
+    {"method": "POST", "path": "/api/blobs/{param}"},
+
+    {"method": "POST", "path": "/v1/messages"}
+  ],
+  "websocket_routes": [
+    {"method": "WS", "path": "/realtime"},
+    {"method": "WS", "path": "/logs/stream"}
+  ]
+}