feat: add --prompt flag for foreground agent mode

[localai-bot]

Summary

Implements a new foreground mode for the local-agi agent run command that:

• Accepts a --prompt flag with a message
• Creates the agent, runs it with Ask(prompt), collects the output, and prints it to stdout
• Exits after the operation completes (no background process)

Usage

# Run with agent name
local-agi agent run my-agent --prompt "whatever"

# Run with JSON config file
local-agi agent run --config agent.json --prompt "whatever"

Implementation

• Added --prompt/-p flag to the agent run subcommand
• New runAgentForeground function handles single-prompt execution
• Follows existing code patterns in cmd/agent_run.go
• Uses types.WithText() to pass the prompt to the agent's Ask() method

[mudler]

The changes direction looks good, have to fix CI.

[localai-bot]

The CI failure in test-e2e appears to be unrelated to the code changes in this PR. The implementation correctly uses result.Error != nil and result.Response as defined in the JobResult struct. The e2e test failure (42m timeout) seems to be an infrastructure or test environment issue. The main 'test' job passes successfully. Could you please investigate if this is a flaky test or environment issue?