fix(spawn): add native OpenClaw prompt support

[0xnxxh]

Summary

ClawTeam currently documents OpenClaw as a first-class runtime, but the generic adapter path still injects prompts with -p. That does not match the current OpenClaw CLI, which expects one-shot agent runs through openclaw agent --message ....

This patch adds native OpenClaw command preparation so bare openclaw spawns are normalized to openclaw agent, and the initial task prompt is passed via --message instead of -p.

What changed

• normalize bare openclaw to openclaw agent
• inject task prompts with --message for OpenClaw
• add adapter/backend regression tests for tmux + subprocess paths
• document the normalized OpenClaw invocation and note that subprocess/profiles are a better fit for headless report workflows

Why

Without this change, commands like:

clawteam spawn tmux openclaw --team ... --task "..."

end up launching OpenClaw with -p, which the current CLI does not support.

This makes the README claim actionable again and removes the need for a local wrapper just to translate ClawTeam prompts into openclaw agent --message.

Related work

• PR fix(spawn): stop subprocess agents from blocking on unread pipes #54 fixes a different but adjacent subprocess issue (unread pipe blocking). I did not duplicate that change here.

Validation

ruff check clawteam/spawn/adapters.py clawteam/spawn/command_validation.py tests/test_adapters.py tests/test_spawn_backends.py tests/test_spawn_cli.py
/root/.openclaw/workspace/.venvs/clawteam/bin/python -m pytest -q tests/test_adapters.py tests/test_spawn_backends.py tests/test_spawn_cli.py

Result:

• ruff check ✅
• 50 passed ✅