fix(compaction): preserve native capability across runtime switches

Stage destination native-compaction capabilities until the complete runtime and context setup succeeds, and restore them with primary and fallback runtimes. Keep native compaction default-deny across live switches and session reconstruction.\n\nVerification: uv run --with pytest --with pyyaml python -m pytest tests/run_agent/test_switch_model_context.py tests/run_agent/test_native_compaction.py tests/run_agent/test_native_compaction_switch_capabilities.py tests/run_agent/test_switch_model_rollback.py tests/run_agent/test_fallback_reasoning_override.py tests/run_agent/test_primary_runtime_restore.py tests/run_agent/test_provider_fallback.py -q -o 'addopts='; uv run --with ruff ruff check <touched files>; git diff --check

cli.py

@@ -10306,6 +10306,7 @@ 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,
                         )
                     self.model = _reset_result.new_model
                     self.provider = _reset_result.target_provider
@@ -11480,6 +11481,7 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin, CLIBillingMixin):
                     api_key=snapshot.get("api_key", ""),
                     base_url=snapshot.get("base_url", ""),
                     api_mode=snapshot.get("api_mode", ""),
+                    capabilities=snapshot.get("capabilities"),
                 )
             except Exception as exc:
                 logger.warning("CLI one-turn model restore failed: %s", exc)
@@ -11624,6 +11626,7 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin, CLIBillingMixin):
                     api_key=result.api_key,
                     base_url=result.base_url,
                     api_mode=result.api_mode,
+                    capabilities=result.runtime_capabilities,
                 )
             except Exception as exc:
                 # The agent rolled itself back to the old working model/client.
@@ -12014,6 +12017,7 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin, CLIBillingMixin):
                     api_key=result.api_key,
                     base_url=result.base_url,
                     api_mode=result.api_mode,
+                    capabilities=result.runtime_capabilities,
                 )
             except Exception as exc:
                 # Agent rolled itself back; roll the CLI back too and abort so a