Prompt Library SDK - first pass

[jsw324]

Add PromptLibrary for Simple Prompt Management

This PR introduces a new PromptLibrary class that provides comprehensive prompt management capabilities within the Agentuity SDK.

Features Added

• Prompt Storage & Versioning: Create, store, and version prompt templates with automatic variable extraction
• Template Compilation: Compile prompts with variables using {{variable}} syntax
• CRUD Operations: Full create, read, update, and delete operations for prompts
• Error Handling: Dedicated exceptions for common prompt management scenarios

Usage

The PromptLibrary is automatically available in your agent context:

# Create a prompt template
await context.prompts.create(
    name="greeting",
    template="Hello {{name}}, welcome to {{service}}!",
    description="A friendly greeting prompt"
)

# Compile prompt with variables
message = await context.prompts.compile(
    "greeting", 
    {"name": "Alice", "service": "Agentuity"}
)
# Returns: "Hello Alice, welcome to Agentuity!"

# Get prompt metadata
prompt_data = await context.prompts.get("greeting")

# List all versions
versions = await context.prompts.versions("greeting")

Integration

• Added to AgentContext as context.prompts
• Exported from main package for direct use
• Built on existing KeyValueStore infrastructure
• Includes comprehensive error handling and validation

This enables simple, version-controlled prompt management without external dependencies.

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✨ Finishing Touches

🧪 Generate Unit Tests

• Create PR with Unit Tests
• Post Copyable Unit Tests in Comment
• Commit Unit Tests in branch AGENT-431

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[jhaynie]

lets use the same pattern as the other services for the span name agentuity.keyvalue.get so this would be agentuity.prompt.create

we should also maybe create a unique uuid for each prompt so we can reference that in the spans and then we can use that to associate different prompts to sessions in the backend.

[jsw324]

closing in favor of #84