L/docs updates 7

[lorenss-m]

Note

Introduces agent/task support to include setup tool output in the initial prompt and improves evaluation plumbing.

• Agents now optionally append ctx.setup_output to the initial prompt via agent.config.append_setup_output or task.agent_config (with append_setup_tool alias)
• Environment collects setup results, aborts on setup tool errors with cleanup, and records 0.0 reward for failed evaluate tools; reward in traces prefers ctx.reward
• TaskAgentConfig adds append_setup_output/append_setup_tool; v4 conversion passes these through; integration test tools map to validation and _integration_test_calls
• datasets/runner propagates system_prompt from task context to agent params
• Docs: shift from hud push to GitHub-based deploy, rename "Push via CLI (Advanced)", add Deploy links, and remove push from CLI tables
• Version bump to 0.5.12 with tests and docs updated accordingly

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