CLI-8: Add parser package exports

Export all public parser components from the package:
- Core types (ParseResult, Context, CommandArgs, ParseError)
- Parser implementations (TextParser, ShellParser)
- Pipeline and registry (ParserPipeline, CommandRegistry, CommandMetadata)
- Protocol definition (Parser)

🤖 Generated with Claude Code (https://claude.ai/code)

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

Author: dugshub

src/cli_patterns/ui/parser/__init__.py

@@ -0,0 +1,55 @@
+"""Parser system for command-line input processing.
+
+This module provides a comprehensive system for parsing user input into
+structured command data, including support for:
+
+- Text commands with flags and options
+- Shell commands with pass-through execution
+- Command registration and metadata management
+- Parser pipelines for routing input to appropriate parsers
+- Intelligent suggestion generation for typos and completions
+
+Core Types:
+    ParseResult: Structured result of parsing user input
+    CommandArgs: Container for positional and named arguments
+    Context: Parsing context with history and session state
+    ParseError: Exception raised during parsing failures
+
+Protocols:
+    Parser: Protocol for implementing custom parsers
+
+Parsers:
+    TextParser: Handles standard text commands with flags/options
+    ShellParser: Handles shell commands prefixed with '!'
+
+Pipeline:
+    ParserPipeline: Routes input to appropriate parsers based on conditions
+
+Registry:
+    CommandRegistry: Manages available commands and provides suggestions
+    CommandMetadata: Metadata for registered commands
+"""
+
+from cli_patterns.ui.parser.parsers import ShellParser, TextParser
+from cli_patterns.ui.parser.pipeline import ParserPipeline
+from cli_patterns.ui.parser.protocols import Parser
+from cli_patterns.ui.parser.registry import CommandMetadata, CommandRegistry
+from cli_patterns.ui.parser.types import CommandArgs, Context, ParseError, ParseResult
+
+__all__ = [
+    # Core Types
+    "ParseResult",
+    "CommandArgs",
+    "Context",
+    "ParseError",
+    # Protocols
+    "Parser",
+    # Parsers
+    "TextParser",
+    "ShellParser",
+    # Pipeline
+    "ParserPipeline",
+    # Registry
+    "CommandRegistry",
+    "CommandMetadata",
+]