refactor: reorganize into monorepo with separate subprojects

Structure webber into three independent subprojects:
- webber-api/: FastAPI backend server with all agent code
- webber-cli/: Standalone CLI client (renamed from cli/ to webber_cli/)
- webber-sandbox/: Test project for functional testing

Key changes:
- Each subproject has its own .venv (Python 3.12+)
- Added sandbox.sh for managing test project templates
- Created sandbox-templates/ with calculator-cli and empty starter
- Updated CI/CD for prefixed tags (api/v*, cli/v*)
- Added comprehensive AGENTS.md with operational instructions
- Added gitignore filtering to glob and grep tools
- Created pyproject.toml for each subproject

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

webber-api/src/cli/ui/__init__.py

@@ -0,0 +1,7 @@
+"""
+CLI UI components.
+"""
+from src.cli.ui.console import get_console
+from src.cli.ui.display import format_response, format_code
+
+__all__ = ["get_console", "format_response", "format_code"]

webber-api/src/cli/ui/console.py

@@ -0,0 +1,37 @@
+"""
+Rich console helpers.
+"""
+from functools import lru_cache
+
+from rich.console import Console
+from rich.theme import Theme
+
+from src.cli.theme import get_theme
+
+
+@lru_cache
+def get_console() -> Console:
+    """Get the shared console instance with theme applied."""
+    theme = get_theme()
+    rich_theme = Theme(theme.to_rich_theme_dict())
+    return Console(theme=rich_theme)
+
+
+def print_info(message: str) -> None:
+    """Print an info message."""
+    get_console().print(f"[info]{message}[/]")
+
+
+def print_warning(message: str) -> None:
+    """Print a warning message."""
+    get_console().print(f"[warning]Warning:[/] {message}")
+
+
+def print_error(message: str) -> None:
+    """Print an error message."""
+    get_console().print(f"[error]Error:[/] {message}")
+
+
+def print_success(message: str) -> None:
+    """Print a success message."""
+    get_console().print(f"[success]{message}[/]")

webber-api/src/cli/ui/display.py

@@ -0,0 +1,84 @@
+"""
+Output formatting and display helpers.
+"""
+import re
+
+from rich.markdown import Markdown
+from rich.syntax import Syntax
+from rich.text import Text
+
+from src.cli.theme import get_theme
+from src.cli.ui.console import get_console
+
+
+def format_response(text: str) -> Markdown | Text:
+    """
+    Format agent response for display.
+
+    Detects markdown and formats appropriately.
+    """
+    # Check if response contains markdown patterns
+    has_markdown = any([
+        "```" in text,  # Code blocks
+        text.startswith("#"),  # Headers
+        "**" in text or "__" in text,  # Bold
+        "- " in text or "* " in text,  # Lists
+    ])
+
+    if has_markdown:
+        return Markdown(text)
+    else:
+        return Text(text)
+
+
+def format_code(code: str, language: str = "python") -> Syntax:
+    """
+    Format code with syntax highlighting.
+
+    Args:
+        code: Source code to format
+        language: Programming language for highlighting
+    """
+    theme = get_theme()
+    return Syntax(
+        code,
+        language,
+        theme=theme.syntax_theme,
+        line_numbers=True,
+        word_wrap=True,
+    )
+
+
+def format_file_path(path: str, line: int | None = None) -> Text:
+    """
+    Format a file path for display.
+
+    Args:
+        path: File path
+        line: Optional line number
+    """
+    text = Text()
+    text.append(path, style="path")
+    if line:
+        text.append(f":{line}", style="dim")
+    return text
+
+
+def truncate_text(text: str, max_length: int = 500, suffix: str = "...") -> str:
+    """
+    Truncate text to maximum length.
+
+    Args:
+        text: Text to truncate
+        max_length: Maximum character length
+        suffix: Suffix to add if truncated
+    """
+    if len(text) <= max_length:
+        return text
+    return text[:max_length - len(suffix)] + suffix
+
+
+def strip_ansi(text: str) -> str:
+    """Remove ANSI escape codes from text."""
+    ansi_pattern = re.compile(r'\x1b\[[0-9;]*m')
+    return ansi_pattern.sub('', text)