feat: support lint command

[Myriad-Dreamin]

Summary:

• add an agentic/lint request returning a diagnostic array
• wire the agentic CLI method branch and help text
• stub the server response with a Hello World diagnostic at the requested file location start

Validation:

• git diff --check
• clang++ -fsyntax-only src/server/service/agent_client.cpp
• clang++ -fsyntax-only src/server/service/agentic.cpp
• clang++ -fsyntax-only src/clice.cc

Note:

• Full cmake build could not complete because the local FetchContent cache is missing kotatsu ref 73814044ce8142f4438a3028f44668675fc09fff while UPDATE_DISCONNECTED is enabled.

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✨ Finishing Touches

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• Create PR with unit tests
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