Add --provider flag to skrun init

[Tarcroi]

Context

skrun init currently asks an interactive prompt to choose the LLM provider. It would be useful to skip this with a CLI flag.

Proposal

# Today: interactive
skrun init my-agent
# → "Choose a provider:" (prompt)

# With flag: no prompt
skrun init my-agent --provider google

The flag should set the model.provider and a default model.name in the generated agent.yaml.

Files to change

• packages/cli/src/commands/init.ts — add --provider option, skip prompt if provided

[terminalchai]

I’d like to take this one.

[terminalchai]

Opened PR #4 for this: #4

[terminalchai]

Replacement PR from the correct terminalchai fork: #5