refactor: remove dead code — 1,784 lines across 77 files (#9180)

Deep scan with vulture, pyflakes, and manual cross-referencing identified:
- 41 dead functions/methods (zero callers in production)
- 7 production-dead functions (only test callers, tests deleted)
- 5 dead constants/variables
- ~35 unused imports across agent/, hermes_cli/, tools/, gateway/

Categories of dead code removed:
- Refactoring leftovers: _set_default_model, _setup_copilot_reasoning_selection,
  rebuild_lookups, clear_session_context, get_logs_dir, clear_session
- Unused API surface: search_models_dev, get_pricing, skills_categories,
  get_read_files_summary, clear_read_tracker, menu_labels, get_spinner_list
- Dead compatibility wrappers: schedule_cronjob, list_cronjobs, remove_cronjob
- Stale debug helpers: get_debug_session_info copies in 4 tool files
  (centralized version in debug_helpers.py already exists)
- Dead gateway methods: send_emote, send_notice (matrix), send_reaction
  (bluebubbles), _normalize_inbound_text (feishu), fetch_room_history
  (matrix), _start_typing_indicator (signal), parse_feishu_post_content
- Dead constants: NOUS_API_BASE_URL, SKILLS_TOOL_DESCRIPTION,
  FILE_TOOLS, VALID_ASPECT_RATIOS, MEMORY_DIR
- Unused UI code: _interactive_provider_selection,
  _interactive_model_selection (superseded by prompt_toolkit picker)

Test suite verified: 609 tests covering affected files all pass.
Tests for removed functions deleted. Tests using removed utilities
(clear_read_tracker, MEMORY_DIR) updated to use internal APIs directly.

hermes_cli/setup.py

@@ -43,14 +43,6 @@ def _model_config_dict(config: Dict[str, Any]) -> Dict[str, Any]:
     return {}
 
 
-def _set_default_model(config: Dict[str, Any], model_name: str) -> None:
-    if not model_name:
-        return
-    model_cfg = _model_config_dict(config)
-    model_cfg["default"] = model_name
-    config["model"] = model_cfg
-
-
 def _get_credential_pool_strategies(config: Dict[str, Any]) -> Dict[str, str]:
     strategies = config.get("credential_pool_strategies")
     return dict(strategies) if isinstance(strategies, dict) else {}
@@ -136,43 +128,6 @@ def _set_reasoning_effort(config: Dict[str, Any], effort: str) -> None:
     agent_cfg["reasoning_effort"] = effort
 
 
-def _setup_copilot_reasoning_selection(
-    config: Dict[str, Any],
-    model_id: str,
-    prompt_choice,
-    *,
-    catalog: Optional[list[dict[str, Any]]] = None,
-    api_key: str = "",
-) -> None:
-    from hermes_cli.models import github_model_reasoning_efforts, normalize_copilot_model_id
-
-    normalized_model = normalize_copilot_model_id(
-        model_id,
-        catalog=catalog,
-        api_key=api_key,
-    ) or model_id
-    efforts = github_model_reasoning_efforts(normalized_model, catalog=catalog, api_key=api_key)
-    if not efforts:
-        return
-
-    current_effort = _current_reasoning_effort(config)
-    choices = list(efforts) + ["Disable reasoning", f"Keep current ({current_effort or 'default'})"]
-
-    if current_effort == "none":
-        default_idx = len(efforts)
-    elif current_effort in efforts:
-        default_idx = efforts.index(current_effort)
-    elif "medium" in efforts:
-        default_idx = efforts.index("medium")
-    else:
-        default_idx = len(choices) - 1
-
-    effort_idx = prompt_choice("Select reasoning effort:", choices, default_idx)
-    if effort_idx < len(efforts):
-        _set_reasoning_effort(config, efforts[effort_idx])
-    elif effort_idx == len(efforts):
-        _set_reasoning_effort(config, "none")
-
 
 
 # Import config helpers