refactor(@angular/cli): optimize MCP tool descriptions for LLM ergonomics and token usage

[clydin]

Refactor the descriptions of get_best_practices, search_documentation, and onpush_zoneless_migration tools to improve semantic clarity and reduce system prompt token footprints. Remove redundant operational boilerplate, eliminate internal server logic leakage related to version clamping, and consolidate overlapping iterative process instructions.

[gemini-code-assist]

Code Review

This pull request refactors and condenses the tool descriptions for the Best Practices, Documentation Search, and Zoneless Migration tools within the Angular CLI MCP implementation. The updates simplify the purpose, use cases, and operational notes for each tool to be more concise. Review feedback identifies several instances where a comma was used immediately after the abbreviation 'e.g.' in user-facing messages, recommending their removal to align with general stylistic conventions.

[clydin]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 9dc21cc
• 22.0.x: f40126b

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