stacklok / toolhive / 24566568053

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Add pkg/vmcp/cli/init.go for vMCP config scaffolding (#4903)

Implement Init(ctx, InitConfig) which discovers running workloads in a
named ToolHive group via an injected Discoverer, renders a commented
starter YAML config pre-populated with one backend entry per accessible
workload, and writes the result to a file (0o600) or an io.Writer.

Workloads returning nil from GetWorkloadAsVMCPBackend are skipped with
a debug log. Empty groups produce a valid YAML skeleton with backends: [].

Includes unit tests covering writer output, file output, nil-backend
skipping, empty groups, discovery errors, YAML validity (loader +
validator), file permissions, and input validation edge cases.

Closes #4882

Co-authored-by: taskbot <taskbot@users.noreply.github.com>

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