chore(release): bump unirl to 0.2.0

[celve]

Summary

Bumps unirl.__version__ from 0.1.0 to 0.2.0. pyproject.toml takes the package version from this attribute.

unirl 0.1.0 has been on PyPI since 2026-06-09, built from the initial-release code, and PyPI never accepts a version twice. main is now 293 commits past that build, including 116 feat commits and several changes that are not drop-in, so the next release should be 0.2.0 rather than 0.1.1:

• DIFFRL_* environment variables and the old socket/lock/shm paths are no longer recognized (refactor: rename residual DiffRL identifiers to UniRL #498).
• The prompt-media format changed (feat(qwen3-omni): support standalone audio modality training #306).
• RolloutReq.stage_config became task_config (refactor(types): rename RolloutReq.stage_config to task_config #255) and then moved onto Part.control (refactor(types): retire stage_config/task_config onto Part.control #263). ComposedSamplingParams (refactor(sampling): modality-keyed sampling dict in RolloutReq, drop ComposedSamplingParams #70) and the compatibility aliases (refactor: delete repo-internal compatibility aliases and re-export facades #366) were removed.
• Recipe paths moved (refactor(examples): group recipes into per-model folders and prune unread precision fields #84, refactor(examples): flatten examples/sft/validation into examples/sft #349).
• The dependency stack moved: transformers >=4.41 → >=5.12,<5.13, torch 2.11 → 2.13, vLLM / vLLM-Omni 0.20 → 0.28 (CUDA 12.9 → 13), and SGLang 0.5.12.post1 → 0.5.19.

The initial commit (a1f8596) is now tagged v0.1.0. Its package code is identical to what PyPI's 0.1.0 was built from. After this merges, its squash commit will be tagged v0.2.0.

Related Issue

N/A — tracked internally.

Test Plan

• uv build --sdist --wheel → unirl-0.2.0.tar.gz and unirl-0.2.0-py3-none-any.whl. The wheel's METADATA reads Version: 0.2.0.
• git grep -n -F '0.1.0' -- ':!unirl-reward-service' → no matches, so the old version string appears nowhere else.
• SKIP=no-commit-to-branch pre-commit run --files unirl/__init__.py → all hooks pass.

Compatibility / Risk

This changes version metadata only. pyproject.toml is the only reader of unirl.__version__; the runtime version checks in unirl/ all query other distributions. unirl-reward-service is versioned separately, with its own pyproject.toml and CHANGELOG.md, and stays at 0.1.0.

Reviewer Notes

• Duplicate-work check: no open PR touches the version. gh pr list --state open --search '__version__ OR "bump version" OR "0.2.0" in:title,body' returns nothing, and the repo has no GitHub releases.
• AI assistance: prepared with an AI coding agent. Every Test Plan result above comes from a command that was actually run.

Checklist

• I reviewed the changed code and removed unrelated/generated artifacts.
• I updated tests, docs, and configs where needed, or explained why not.

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[CjhHa1]

LGTM