refactor: remove 24 confirmed dead functions — 432 lines of unused code

Each function was verified to have exactly 1 reference in the entire
codebase (its own definition). Zero calls, zero imports, zero string
references anywhere including tests.

Removed by category:

Superseded wrappers (replaced by newer implementations):
- agent/anthropic_adapter.py: run_hermes_oauth_login, refresh_hermes_oauth_token
- hermes_cli/callbacks.py: sudo_password_callback (superseded by CLI method)
- hermes_cli/setup.py: _set_model_provider, _sync_model_from_disk
- tools/file_tools.py: get_file_tools (superseded by registry.register)
- tools/cronjob_tools.py: get_cronjob_tool_definitions (same)
- tools/terminal_tool.py: _check_dangerous_command (_check_all_guards used)

Dead private helpers (lost their callers during refactors):
- agent/anthropic_adapter.py: _convert_user_content_part_to_anthropic
- agent/display.py: honcho_session_line, write_tty
- hermes_cli/providers.py: _build_labels (+ dead _labels_cache var)
- hermes_cli/tools_config.py: _prompt_yes_no
- hermes_cli/models.py: _extract_model_ids
- hermes_cli/uninstall.py: log_error
- gateway/platforms/feishu.py: _is_loop_ready
- tools/file_operations.py: _read_image (64-line method)
- tools/process_registry.py: cleanup_expired
- tools/skill_manager_tool.py: check_skill_manage_requirements

Dead class methods (zero callers):
- run_agent.py: _is_anthropic_url (logic duplicated inline at L618)
- run_agent.py: _classify_empty_content_response (68-line method, never wired)
- cli.py: reset_conversation (callers all use new_session directly)
- cli.py: _clear_current_input (added but never wired in)

Other:
- gateway/delivery.py: build_delivery_context_for_tool
- tools/browser_tool.py: get_active_browser_sessions

hermes_cli/callbacks.py

@@ -63,47 +63,6 @@ def clarify_callback(cli, question, choices):
     )
 
 
-def sudo_password_callback(cli) -> str:
-    """Prompt for sudo password through the TUI.
-
-    Sets up a password input area and blocks until the user responds.
-    """
-    timeout = 45
-    response_queue = queue.Queue()
-
-    cli._sudo_state = {"response_queue": response_queue}
-    cli._sudo_deadline = _time.monotonic() + timeout
-
-    if hasattr(cli, "_app") and cli._app:
-        cli._app.invalidate()
-
-    while True:
-        try:
-            result = response_queue.get(timeout=1)
-            cli._sudo_state = None
-            cli._sudo_deadline = 0
-            if hasattr(cli, "_app") and cli._app:
-                cli._app.invalidate()
-            if result:
-                cprint(f"\n{_DIM}  ✓ Password received (cached for session){_RST}")
-            else:
-                cprint(f"\n{_DIM}  ⏭ Skipped{_RST}")
-            return result
-        except queue.Empty:
-            remaining = cli._sudo_deadline - _time.monotonic()
-            if remaining <= 0:
-                break
-            if hasattr(cli, "_app") and cli._app:
-                cli._app.invalidate()
-
-    cli._sudo_state = None
-    cli._sudo_deadline = 0
-    if hasattr(cli, "_app") and cli._app:
-        cli._app.invalidate()
-    cprint(f"\n{_DIM}  ⏱ Timeout — continuing without sudo{_RST}")
-    return ""
-
-
 def prompt_for_secret(cli, var_name: str, prompt: str, metadata=None) -> dict:
     """Prompt for a secret value through the TUI (e.g. API keys for skills).