fix(translator): ESM-safe registry + tool-id pairing + responses max_tokens; add real-creds tests

- translator/index.js: replace require() with static side-effect imports (ESM-safe),
  lazy-init registry maps to survive circular import order
- openai-responses->openai: map max_output_tokens -> max_tokens (avoid leaking field upstream)
- gemini/antigravity -> openai: derive deterministic tool_call id from name so
  functionCall/functionResponse pair correctly (fixes provider tool-pairing 400s)
- add offline unit tests (finish-reason, usage, session-manager, ollama malformed args, const guard)
- add real-creds integration tests (provider-cases + all-formats matrix: 6 inbound formats x 4 scenarios)

Includes co-located provider registry refactor (pricing/capabilities/media providers) and sessionManager updates.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/utils/sessionManager.js

@@ -79,4 +79,126 @@ export function generateBinaryStyleId() {
  */
 export function clearSessionStore() {
     runtimeSessionStore.clear();
+    assistantSessionStore.clear();
 }
+
+// Conversation-stable session store: Key = hash(scope+assistant text), Value = { sessionId, lastUsed }
+const assistantSessionStore = new Map();
+const ASSISTANT_MIN_LEN = 50;
+const ASSISTANT_CAP_LEN = 200;
+const MAX_ASSISTANT_SESSIONS = 5000;
+
+// Client headers/body fields that carry an upstream session id (priority order)
+const SESSION_HEADER_KEYS = ["x-session-id", "session_id", "x-amp-thread-id", "x-client-request-id"];
+const CLAUDE_CODE_SESSION_RE = /_session_([a-f0-9-]+)$/;
+
+function sha16(text) {
+    return crypto.createHash("sha256").update(text).digest("hex").slice(0, 16);
+}
+
+// Normalize a session id candidate (trim, length cap)
+function normalizeSessionId(value) {
+    if (typeof value !== "string") return null;
+    const v = value.trim();
+    if (!v || v.length > 256) return null;
+    return v;
+}
+
+// Extract Claude Code session id from metadata.user_id (_session_{uuid} | JSON {session_id})
+function extractClaudeCodeSession(userId) {
+    if (typeof userId !== "string" || !userId) return null;
+    const m = userId.match(CLAUDE_CODE_SESSION_RE);
+    if (m) return m[1];
+    if (userId[0] === "{") {
+        try { return normalizeSessionId(JSON.parse(userId)?.session_id); } catch { /* noop */ }
+    }
+    return null;
+}
+
+// Lowercase-key lookup for raw client headers
+function headerValue(headers, key) {
+    if (!headers || typeof headers !== "object") return null;
+    return normalizeSessionId(headers[key] ?? headers[key.toLowerCase()]);
+}
+
+// Read client-provided session id from headers/body (no generation)
+function extractClientSessionId(headers, body) {
+    const claude = extractClaudeCodeSession(body?.metadata?.user_id);
+    if (claude) return `claude:${claude}`;
+    for (const key of SESSION_HEADER_KEYS) {
+        const v = headerValue(headers, key);
+        if (v) return v;
+    }
+    const fromBody =
+        normalizeSessionId(body?.prompt_cache_key) ||
+        normalizeSessionId(body?.session_id) ||
+        normalizeSessionId(body?.conversation_id) ||
+        normalizeSessionId(body?.metadata?.user_id);
+    return fromBody || null;
+}
+
+// Accumulate assistant text from OpenAI/Responses-style input/messages (cap-limited)
+function accumulateAssistantText(body) {
+    const items = Array.isArray(body?.input) ? body.input
+        : Array.isArray(body?.messages) ? body.messages : null;
+    if (!items) return "";
+    let text = "";
+    for (const item of items) {
+        if (item?.role !== "assistant") continue;
+        if (typeof item.content === "string") text += item.content;
+        else if (Array.isArray(item.content)) {
+            for (const c of item.content) text += c?.text || c?.output || "";
+        }
+        if (text.length >= ASSISTANT_CAP_LEN) break;
+    }
+    return text;
+}
+
+// Stable session id keyed on accumulated assistant text (avoids collision on identical first user prompt)
+function assistantTextSessionId(scope, body) {
+    const text = accumulateAssistantText(body);
+    if (text.length < ASSISTANT_MIN_LEN) return null;
+    const hash = sha16(`${scope}:${text.slice(0, ASSISTANT_CAP_LEN)}`);
+    const existing = assistantSessionStore.get(hash);
+    if (existing) {
+        existing.lastUsed = Date.now();
+        return existing.sessionId;
+    }
+    if (assistantSessionStore.size >= MAX_ASSISTANT_SESSIONS) {
+        assistantSessionStore.delete(assistantSessionStore.keys().next().value);
+    }
+    const sessionId = generateBinaryStyleId();
+    assistantSessionStore.set(hash, { sessionId, lastUsed: Date.now() });
+    return sessionId;
+}
+
+/**
+ * Resolve a conversation-stable session id (generalizes Codex resolveCacheSessionId).
+ * Priority: client session → accumulated-assistant-text hash → workspaceId → per-connection.
+ *
+ * @param {object} opts
+ * @param {object} [opts.headers] - Raw client request headers (lowercase keys)
+ * @param {object} [opts.body] - Parsed request body
+ * @param {string} [opts.connectionId] - Connection identifier (fallback scope)
+ * @param {string} [opts.workspaceId] - Provider workspace id (account-wide fallback)
+ * @param {string} [opts.scope] - Provider scope to isolate cache keys across providers
+ * @returns {string} A stable session id
+ */
+export function resolveSessionId({ headers, body, connectionId, workspaceId, scope = "" } = {}) {
+    const client = extractClientSessionId(headers, body);
+    if (client) return client;
+    const fromAssistant = assistantTextSessionId(`${scope}:${connectionId || ""}`, body);
+    if (fromAssistant) return fromAssistant;
+    const ws = normalizeSessionId(workspaceId);
+    if (ws) return ws;
+    return deriveSessionId(connectionId);
+}
+
+// Cleanup expired assistant-session entries
+const assistantCleanup = setInterval(() => {
+    const now = Date.now();
+    for (const [key, entry] of assistantSessionStore) {
+        if (now - entry.lastUsed > MEMORY_CONFIG.sessionTtlMs) assistantSessionStore.delete(key);
+    }
+}, MEMORY_CONFIG.sessionCleanupIntervalMs);
+if (assistantCleanup.unref) assistantCleanup.unref();