feat: implement CLI visual theme, update documentation examples, and add…

feat: implement CLI visual theme, update documentation examples, and add environment configuration template

cli/theme.py

+"""Shared visual language for the interactive terminal experience."""
+
+from __future__ import annotations
+
+import questionary
+from rich.theme import Theme
+
+CLI_THEME = Theme(
+    {
+        "brand": "bold #22d3ee",
+        "brand.secondary": "bold #60a5fa",
+        "muted": "#64748b",
+        "label": "bold #94a3b8",
+        "value": "bold #f8fafc",
+        "success": "bold #34d399",
+        "warning": "bold #fbbf24",
+        "danger": "bold #fb7185",
+        "stage.active": "bold #22d3ee",
+        "stage.done": "#34d399",
+        "stage.pending": "#64748b",
+        "activity.tool": "bold #a78bfa",
+        "activity.agent": "bold #60a5fa",
+        "activity.system": "bold #94a3b8",
+        "activity.user": "bold #34d399",
+    }
+)
+
+
+PROMPT_STYLE = questionary.Style(
+    [
+        ("qmark", "fg:#22d3ee bold"),
+        ("question", "bold"),
+        ("answer", "fg:#34d399 bold"),
+        ("pointer", "fg:#22d3ee bold"),
+        ("highlighted", "fg:#22d3ee bold"),
+        ("selected", "fg:#34d399"),
+        ("checkbox", "fg:#64748b"),
+        ("checkbox-selected", "fg:#34d399 bold"),
+        ("instruction", "fg:#64748b"),
+        ("text", "fg:#f8fafc"),
+        ("disabled", "fg:#475569 italic"),
+    ]
+)
+
+PROMPT_MARK = "›"
+PROMPT_POINTER = "▸"