[arzafran]

What this does

programa race --agent opencode now actually gives OpenCode the prompt. OpenCode reads a bare argument as a project path, so until now it opened with an empty prompt (or failed to find a directory) and the race never started on the task.

Summary

• raceAgentLaunchCommand adds --prompt before the quoted prompt for opencode. Claude Code and Codex still take it as a positional argument.

• programa worktree create --from-issue --agent ... had its own copy of the same rule; it now calls raceAgentLaunchCommand, so both paths start agents the same way.

• tests/test_cli_race_agent_launch.py checks what gets typed into the pane for each agent, including a prompt with an apostrophe.

• The --from-issue test from feat: create a worktree workspace from a GitHub issue #472 checked workspace_id in --json output, but --json prints refs by default and drops that field, so main has been red on it since feat: create a worktree workspace from a GitHub issue #472. It now checks workspace_ref.

Commits follow the regression-test policy: the first adds only the test and should fail CI, the second adds the fix.

Fixes INC-265

Test Plan

• On the first commit, the CLI test job fails in test_cli_race_agent_launch.py on the opencode case.
• On the second commit, CI is green.
• programa race --agent opencode "say hi" starts OpenCode with "say hi" already in its prompt.