chore: initial commit of Go API gateway

Baseline for the Kong replacement on api.riotpiao.com. Brings the working tree under version control for the first time: gateway source, the task board that drives the agent runs, test fixtures, and K8s manifests. Anchor the gateway ignore rule to the repo root. Unanchored, "gateway" also matched the cmd/gateway/ source directory, so the program entrypoint was excluded from every commit. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
2026-08-19 20:54:34 -07:00
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+# 2.3 — Unknown and missing model errors (RED)
+
+Phase: 2 — LLM surface
+Stage: RED
+Depends on: [2.1](2.1-model-registry.md), [2.2](2.2-body-based-dispatch.md)
+
+- [ ] `POST /v1/chat/completions` with a `model` that is not in the configured registry returns a 4xx client error, never 5xx
+- [ ] A request with no `model` field, a null `model`, or an empty-string `model` is the same class of client error
+- [ ] A body that is not valid JSON is also a client error, distinguishable from an unknown model
+- [ ] The response is RFC 9457 with `Content-Type: application/problem+json`
+- [ ] The problem body names the rejected value and enumerates every currently configured model name, derived from the registry rather than written out by hand
+- [ ] No fallback to a default model happens under any of these conditions, and no upstream is contacted
+- [ ] The rejection is logged with its reason; the request body is not logged
+
+Write the failing tests first. A silent fallback to a default model is the specific
+failure mode this task exists to prevent: it turns a client typo into a bill against
+the wrong GPU and hides the mistake from the caller.
+
+## Verify
+
+```bash
+curl -s -i localhost:8080/v1/chat/completions -H 'content-type: application/json' \
+  -d '{"model":"gpt-4","messages":[]}'
+# expected: 400 (or 404), content-type: application/problem+json, body lists reasoning, ornith:35b, qwen2.5:3b-instruct, and the embedding/rerank models
+
+curl -s -o /dev/null -w '%{http_code}\n' localhost:8080/v1/chat/completions \
+  -H 'content-type: application/json' -d '{"messages":[]}'
+# expected: 4xx, no upstream stub recorded any hit
+
+curl -s -o /dev/null -w '%{http_code}\n' localhost:8080/v1/chat/completions \
+  -H 'content-type: application/json' -d 'not json'
+# expected: 400, problem+json, reason distinct from unknown-model
+```