engram: HTTP server CORS wildcard + auth-off-by-default enables CSRF graph exfiltration and persistent indirect prompt injection
### Summary The local HTTP server started by `engram server` (binding `127.0.0.1:7337` by default) was exposed to any browser origin with no authentication unless `ENGRAM_API_TOKEN` was explicitly set. Combined with `Access-Control-Allow-Origin: *` on every response and a body parser that did not require `Content-Type: application/json`, this allowed a malicious web page the developer visited to: 1. **Exfiltrate** the local knowledge graph via `GET /query` and `GET /stats` (function names, file layout, recorded decisions/mistakes). 2. **Inject persistent prompt-injection payloads** via `POST /learn`, which wrote `mistake`/`decision` nodes t
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