feat(benchmarks): default PinchBench to MiMo v2.5 Pro, add direct-mimo routing

PinchBench runner now defaults to openrouter/xiaomi/mimo-v2.5-pro instead
of deepseek/deepseek-chat. Adds --direct-mimo flag for routing through
Xiaomi's API directly (bypasses OpenRouter), with tp-/sk- key type
detection and endpoint mismatch warnings.

Harbor adapter gains --provider CLI flag for MiMo provider routing.

Known issues documented in docs/MIMO_BENCHMARK_ISSUES.md:
- PinchBench model validation requires OpenRouter prefix
- OPENROUTER_API_KEY needed even for some direct-provider paths
- Token Plan vs pay-as-you-go key/endpoint mismatch
- PinchBench runs through OpenClaw, not CodeWhale

scripts/benchmarks/harbor/__init__.py

@@ -52,6 +52,12 @@ class CodeWhaleAgent(BaseInstalledAgent):
             type="str",
             default="high",
         ),
+        CliFlag(
+            "provider",
+            cli="--provider",
+            type="str",
+            default=None,
+        ),
     ]
 
     @staticmethod