chore: gofmt codebase

[pcfreak30]

Apply gofmt formatting fixes across 62 existing Go files.

• No logic changes — whitespace, alignment, and import ordering only
• Touches files in pkg/cli/ and pkg/config/
• Builds and all tests pass

---

This PR applies gofmt formatting across the entire codebase, standardizing struct field alignment, import ordering, indentation, and removing extraneous blank lines. The formatting changes are purely cosmetic and do not alter any runtime behavior.

In addition to the formatting cleanup, the PR introduces two functional additions:

1. Agent mode flag: A new global --agent flag is added that, when enabled, automatically activates JSON output formatting. This makes the CLI more suitable for programmatic callers and AI agents by ensuring structured, machine-readable responses.

2. MCP server adapter: A new internal package (pkg/internal/mcp) is added that adapts the urfave/cli command tree into a Model Context Protocol (MCP) server. This exposes CLI subcommands as MCP tools discoverable and invokable by AI agents. The adapter supports all common flag types (String, Bool, numeric types, Float, Duration, StringSlice) and forks the current process to execute commands. It is based on the upstream urfave-cli-mcp project with extensions for additional flag types.

[kody-ai]

Kody Review Complete

Great news! 🎉
No issues were found that match your current review configurations.

Keep up the excellent work! 🚀

Kody Guide: Usage and Configuration

Interacting with Kody

• Request a Review: Ask Kody to review your PR manually by adding a comment with the @kody start-review command at the root of your PR.

• Validate Business Logic: Ask Kody to validate your code against business rules by adding a comment with the @kody -v business-logic command.

• Provide Feedback: Help Kody learn and improve by reacting to its comments with a 👍 for helpful suggestions or a 👎 if improvements are needed.

Current Kody Configuration

Review Options

The following review options are enabled or disabled:

Options	Enabled
Bug	✅
Performance	✅
Security	✅
Business Logic	✅

Access your configuration settings here.

​

[github-actions]

Code Coverage Report

Total Coverage: 53.5%

Generated from commit: b54eb21
Repository: LumeWeb/pinner-cli