Bump version to 1.2.2

[liana313]

Release v1.2.2. Bumps pyproject.toml 1.2.1 → 1.2.2 and regenerates uv.lock to match (so the locked-constraints CI step stays green).

Notable changes shipping in this release since 1.2.1:

• Fix gpt-5/reasoning-model accuracy: model-aware max_tokens default #260 — gpt-5 / reasoning-model accuracy fix: model-aware max_tokens default + truncation warning (closes gpt-5 not working well #255)
• Fix flaky test_pairwise_judge (ambiguous row removed) #262 — fix flaky test_pairwise_judge
• Consolidate duplicate benchmark directories (benchmark/ -> benchmarks/) #261 — consolidate duplicate benchmark directories
• Experiment scripts for Biodex and Reranking #219 — Biodex + reranking benchmark suites (resolves Error Re-Creating Biodex Results: FileNotFoundError: [Errno 2] No such file or directory: 'biodex-reactions.csv' #227)

On merge I'll tag v1.2.2 off main, which triggers publish.yml to build and publish to PyPI.

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