[Feat] Add approve_delegation_request

[BrettCleary]

This pull request updates the CoinFello CLI to improve security and user control around blockchain delegation signing. Instead of automatically signing delegations when a prompt requires extra permissions, the CLI now saves delegation requests to a file for explicit user review and approval. The documentation has been updated throughout to reflect this new two-step delegation flow, and a new command, approve_delegation_request, has been introduced.

Delegation Flow Redesign and Command Additions:

• The send_prompt command no longer signs delegation requests automatically. Instead, it saves the request to a local file (pending_delegation.json) and logs the details to the terminal. Users must now explicitly approve and sign delegations using the new approve_delegation_request command. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

Documentation and Reference Updates:

• All relevant documentation files (SKILL.md, REFERENCE.md, README.md) have been updated to describe the new delegation flow, including the new approve_delegation_request command, expected outputs, and error messages. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

Configuration and Versioning:

• The CLI version is bumped to 0.3.0 to reflect these breaking changes in delegation handling.
• The CONFIG_DIR constant is now exported from src/config.ts for use in other modules.

Error Handling Improvements:

• New error messages have been added for missing pending delegation requests, guiding users to run send_prompt before attempting to approve a delegation.

These changes together make delegation signing more secure and transparent, requiring explicit user consent before any blockchain delegation is signed and submitted.