fix(agent,claw402): harden agent runtime and strip max_tokens for thinking models

- Fix Stop() race condition using sync.Once
- Add ensureHistory() to prevent nil panic in planner/dispatcher
- Add bounds check on trader ID slicing
- Log saveExecutionState and clearSetupState errors instead of discarding
- Remove always-true modelID condition in onboard setup
- Add Chinese setup keywords and expand model name aliases
- Strip max_tokens from claw402 requests to avoid thinking-model budget exhaustion
- Hide Agent nav tab (Beta) pending merge to main
- Sync tests with code changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

mcp/payment/claw402.go

@@ -225,18 +225,34 @@ func (c *Claw402Client) signPayment(paymentHeaderB64 string) (string, error) {
 
 // ── Format overrides for Anthropic endpoints ─────────────────────────────────
 
+// stripMaxTokens removes per-call max_tokens caps from a body destined for
+// claw402. The gateway already enforces a per-route default/floor/cap
+// (see providers/*.yaml token_default_max_out / token_min_max_out /
+// token_max_out_cap). Sending a small max_tokens here on a thinking model
+// (Kimi K2.5, DeepSeek R1/V4) caused reasoning tokens to consume the entire
+// budget and left `delta.content` empty, surfacing as "no content received".
+// upto settles on real usage, so removing the cap costs nothing extra.
+func stripMaxTokens(body map[string]any) map[string]any {
+	if body == nil {
+		return body
+	}
+	delete(body, "max_tokens")
+	delete(body, "max_completion_tokens")
+	return body
+}
+
 func (c *Claw402Client) BuildMCPRequestBody(systemPrompt, userPrompt string) map[string]any {
 	if c.claudeProxy != nil {
 		return c.claudeProxy.BuildMCPRequestBody(systemPrompt, userPrompt)
 	}
-	return c.Client.BuildMCPRequestBody(systemPrompt, userPrompt)
+	return stripMaxTokens(c.Client.BuildMCPRequestBody(systemPrompt, userPrompt))
 }
 
 func (c *Claw402Client) BuildRequestBodyFromRequest(req *mcp.Request) map[string]any {
 	if c.claudeProxy != nil {
 		return c.claudeProxy.BuildRequestBodyFromRequest(req)
 	}
-	return c.Client.BuildRequestBodyFromRequest(req)
+	return stripMaxTokens(c.Client.BuildRequestBodyFromRequest(req))
 }
 
 func (c *Claw402Client) ParseMCPResponse(body []byte) (string, error) {