fix: #3357 output schema names for Literal types

[Aphroq]

Summary

Fix AgentOutputSchema.name() so typing arguments without __name__, such as Literal values, are formatted instead of raising.

This keeps valid structured output types like Literal["ok"] and list[Literal["ok", "done"]] usable when the runner records the output type name for tracing.

Test plan

• uv run pytest tests/test_output_tool.py -q
• bash .agents/skills/code-change-verification/scripts/run.sh

The focused output tool test passes on this branch directly. The full shell verification script was run in a local validation checkout where this branch was temporarily combined with the pending tracing shutdown fix, so the tracing atexit cleanup test would not time out.

Issue number

Closes #3357

Checks

• I've added new tests (if relevant)
• I've run make lint and make format
• I've made sure tests pass