make ramalama-client-core send default model to server

[rhatdan]

Also move most of the helper functions into ramalamashell class

Summary by Sourcery

Enable automatic sending of a default model from the client to the server and restructure helper functions into the RamalamaShell class.

New Features:

• Make the client send a default model to the server when none is specified

Enhancements:

• Move helper functions into the RamalamaShell class for improved organization

[sourcery-ai]

Reviewer's Guide

This PR updates the client core to always include a default model in outgoing server requests and consolidates helper utilities into the Ramalamashell class for improved code organization.

File-Level Changes

Change	Details	Files
Include default model in server requests	Added fallback constant for defaultModel Enhanced request builder to set defaultModel when none provided Augmented send logic to attach model field to payload	libexec/ramalama/ramalama-client-core
Refactor helper functions into Ramalamashell class	Moved parseArgs, formatResponse, buildHeaders into class methods Removed standalone helper function definitions Updated internal calls to invoke the new class methods	libexec/ramalama/ramalama-client-core

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[sourcery-ai]

Hey @rhatdan - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

issue (code-quality): Inline variable that is immediately returned (inline-immediately-returned-variable)

[rhatdan]

@ericcurtin @olliewalsh @bmahabirbu @nathan-weinberg PTAL

[bmahabirbu]

LGTM