spec(control-plane): add Workspace Initialization for repo cloning

[jsell-rh]

Summary

• Add Workspace Initialization section to control-plane.spec.md documenting the init container pattern for cloning repos into /workspace/repos/ before the runner starts
• Documents trigger conditions (session.RepoURL or session.Repos), repo URL normalization, credential injection for private repos, and the current gap status
• Adds REPOS_JSON to the environment variables table

Context

Sessions created with --repo-url via the CLI/TUI currently produce an empty directory at /workspace/repos/<name> — the control plane sets REPOS_JSON as an env var but does not create an init container to actually clone the repo. The operator implements this correctly; this spec defines the same behavior for the control plane so it can be implemented.

Test plan

• Review spec section for completeness against operator implementation
• Verify init container behavior matches operator pattern in reconcileSpecReposWithPatch
• Confirm credential injection approach is consistent with CP credential resolver

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