fix(compaction): preserve switch compatibility fixtures

Keep model-switch callers compatible with result objects created before runtime_capabilities was added, and do not roll back minimal agents that lack optional LM Studio helpers. Preserve rollback for real helper failures.

cli.py

@@ -10306,7 +10306,9 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin, CLIBillingMixin):
                             api_key=_reset_result.api_key,
                             base_url=_reset_result.base_url,
                             api_mode=_reset_result.api_mode,
-                            capabilities=_reset_result.runtime_capabilities,
+                            capabilities=getattr(
+                                _reset_result, "runtime_capabilities", None
+                            ),
                         )
                     self.model = _reset_result.new_model
                     self.provider = _reset_result.target_provider
@@ -11626,7 +11628,7 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin, CLIBillingMixin):
                     api_key=result.api_key,
                     base_url=result.base_url,
                     api_mode=result.api_mode,
-                    capabilities=result.runtime_capabilities,
+                    capabilities=getattr(result, "runtime_capabilities", None),
                 )
             except Exception as exc:
                 # The agent rolled itself back to the old working model/client.
@@ -12017,7 +12019,7 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin, CLIBillingMixin):
                     api_key=result.api_key,
                     base_url=result.base_url,
                     api_mode=result.api_mode,
-                    capabilities=result.runtime_capabilities,
+                    capabilities=getattr(result, "runtime_capabilities", None),
                 )
             except Exception as exc:
                 # Agent rolled itself back; roll the CLI back too and abort so a