feat(cli): add optional model field to Workspace schema

[feloy]

Add an optional model field to the Workspace schema to allow specifying which model is used for the workspace agent.

Closes #25

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 287ee933-663f-448c-aa84-f5fbd141b603

📥 Commits

Reviewing files that changed from the base of the PR and between ce0c181 and 23aeb4d.

📒 Files selected for processing (2)

• cli/README.md
• cli/openapi.yaml

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📝 Walkthrough

Walkthrough

The pull request adds a new optional model field to the Kortex CLI workspace schema and documentation. The field is introduced to the Workspace schema in the OpenAPI specification and reflected in example JSON outputs for workspace initialization and listing operations.

Changes

Cohort / File(s)	Summary
Documentation cli/README.md	Updated JSON output examples for workspace operations (init, init --project, workspace list) to include the new model field with sample value "model1".
Schema Definition cli/openapi.yaml	Added model property (string type) to components/schemas/Workspace and included model: model1 in example payloads for /init/verbose and /list endpoints.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• feat: add workspace management endpoints to OpenAPI spec #10: Introduced the initial Workspace schema and workspace endpoints that are now being extended with the new model field.
• feat: add project in Workspace #17: Previously added the project property to the Workspace schema following a similar pattern of adding top-level workspace attributes.
• feat: add agent to cli Workspace #20: Previously added the agent property to the Workspace schema, establishing the pattern for expanding workspace metadata fields.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically summarizes the main change: adding an optional model field to the Workspace schema.
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose of adding the model field and referencing the linked issue.
Linked Issues check	✅ Passed	The pull request successfully implements the requirement from issue #25 by adding an optional model field to the Workspace schema in both the README and OpenAPI specification.
Out of Scope Changes check	✅ Passed	All changes are in scope: README and OpenAPI schema updates directly address the linked issue requirement without introducing unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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