Add compact progress output

[adrianmross]

Summary

• add compact progress reporting for host prep commands
• keep JSON stdout clean and suppress progress with --silent
• add --verbose to print every progress step as normal stderr log lines
• cover silent/verbose behavior in the hermetic CLI contract test

Validation

• go test ./...
• go build -o /private/tmp/oci-hop-progress ./cmd/oci-hop

[Copilot]

Pull request overview

This PR adds compact, configurable progress reporting (stderr) to the CLI’s host-preparation flows so interactive use is less noisy while keeping JSON stdout outputs machine-friendly.

Changes:

• Introduces a progressReporter that uses a spinner on TTYs and plain step lines otherwise, with --silent and --verbose controls.
• Wires progress steps into hop (root host mode) and host prep subcommands (ensure, repair --ensure, ssh).
• Extends the hermetic CLI contract test to cover --silent and --verbose behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
README.md	Documents the new compact progress behavior and the --silent / --verbose flags.
cmd/oci-hop/main.go	Adds the progress reporter + global flags and integrates progress steps into host-prep command execution.
cmd/oci-hop/main_test.go	Adds contract assertions for silent/verbose progress output behavior.

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