Revert "refactor: clean up legacy code, rename hopper to entity_extractor, and add third-party notices"

This reverts commit 54fcef9887.

Please do not submit unrelated docs and codes in the same commit. I am reverting this commit so that the related files can be submitted in better-organized future commits.

artemis/utils/cli_selection.py

@@ -0,0 +1,154 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+
+import inquirer
+from rich.console import Console
+from rich.prompt import Prompt
+from rich.text import Text
+
+
+def select_provider_and_model(
+    console: Console,
+    available_providers: list[str],
+    available_models: dict,
+    default_provider: str,
+    default_model: str,
+    provider: str | None = None,
+    model: str | None = None,
+) -> tuple[str, str]:
+    """Interactive selection of LLM provider and model with arrow-key dropdowns when available.
+
+    Args:
+        console: Rich console for output
+        available_providers: List of available provider names
+        available_models: Dict mapping providers to their available models
+        default_provider: Default provider to use
+        default_model: Default model to use
+        provider: Pre-selected provider (optional)
+        model: Pre-selected model (optional)
+
+    Returns:
+        Tuple of (selected_provider, selected_model)
+    """
+    final_provider = provider
+    final_model = model
+
+    # Interactive provider selection
+    if not final_provider:
+        console.print("\n🤖 [bold cyan]LLM Provider Selection[/bold cyan]")
+        final_provider = _select_from_list(
+            console=console,
+            item_type="provider",
+            choices=available_providers,
+            default=default_provider,
+            message="Select LLM provider",
+        )
+
+    # Interactive model selection
+    if not final_model:
+        console.print(f"\n🎯 [bold green]Model Selection for {final_provider}[/bold green]")
+        available_model_list = (
+            available_models[final_provider]
+            if final_provider
+            else available_models[default_provider]
+        )
+
+        default_model_for_provider = (
+            default_model if default_model in available_model_list else available_model_list[0]
+        )
+
+        final_model = _select_from_list(
+            console=console,
+            item_type="model",
+            choices=available_model_list,
+            default=default_model_for_provider,
+            message=f"Select model for {final_provider}",
+        )
+
+    return final_provider, final_model
+
+
+def _select_from_list(
+    console: Console,
+    item_type: str,
+    choices: list[str],
+    default: str,
+    message: str,
+) -> str:
+    """Select an item from a list using arrow keys when available, fallback to numbered selection.
+
+    Args:
+        console: Rich console for output
+        item_type: Type of item being selected (for error messages)
+        choices: List of choices to select from
+        default: Default choice
+        message: Message to display in dropdown
+
+    Returns:
+        Selected choice
+    """
+    # Try arrow-key dropdown if TTY is available, fallback to numbered selection
+    if sys.stdin.isatty():
+        try:
+            questions = [
+                inquirer.List(
+                    "selection",
+                    message=f"{message} (use arrow keys)",
+                    choices=choices,
+                    default=default,
+                ),
+            ]
+            answers = inquirer.prompt(questions)
+            return answers["selection"] if answers else default
+        except Exception:
+            # Fallback to numbered selection
+            return _numbered_selection(console, item_type, choices, default)
+    else:
+        return _numbered_selection(console, item_type, choices, default)
+
+
+def _numbered_selection(console: Console, item_type: str, choices: list[str], default: str) -> str:
+    """Fallback numbered selection when arrow keys aren't available."""
+    choices_text = "\n".join([f"  {i + 1}. {choice}" for i, choice in enumerate(choices)])
+    console.print(f"Available {item_type}s:\n{choices_text}")
+
+    default_idx = choices.index(default) + 1 if default in choices else 1
+
+    while True:
+        choice = Prompt.ask(
+            f"Select {item_type} (1-{len(choices)}) or press Enter for default",
+            default=str(default_idx),
+        )
+        try:
+            choice_idx = int(choice) - 1
+            if 0 <= choice_idx < len(choices):
+                return choices[choice_idx]
+            else:
+                console.print("[red]Invalid choice. Please try again.[/red]")
+        except ValueError:
+            console.print("[red]Please enter a number.[/red]")
+
+
+def display_llm_config(console: Console, provider: str, model: str) -> None:
+    """Display the selected LLM configuration with colors."""
+    config_text = Text()
+    config_text.append("🤖 LLM Configuration: ", style="bold white")
+    config_text.append("Provider: ", style="white")
+    config_text.append(f"{provider}", style="bold cyan")
+    config_text.append(" | Model: ", style="white")
+    config_text.append(f"{model}", style="bold green")
+
+    console.print(config_text)