feat(config): document resume-recap tuning keys in DEFAULT_CONFIG

The hardcoded constants in _display_resumed_history were exposed as
config in PR #4434; declare them in DEFAULT_CONFIG and the CLI fallback
dict so they show up in 'hermes config' diagnostics and the schema
validator.

cli.py

@@ -415,6 +415,12 @@ def load_cli_config() -> Dict[str, Any]:
         "display": {
             "compact": False,
             "resume_display": "full",
+            # Recap tuning for /resume — see hermes_cli/config.py DEFAULT_CONFIG.
+            "resume_exchanges": 10,
+            "resume_max_user_chars": 300,
+            "resume_max_assistant_chars": 200,
+            "resume_max_assistant_lines": 3,
+            "resume_skip_tool_only": True,
             "show_reasoning": False,
             "streaming": True,
             "busy_input_mode": "interrupt",