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Release OpenEnv 0.12.0 (rolling release PR, candidate for Thursday 2026-11-05)

Version change only: pyproject.toml, envs/grid_world_env/uv.lock, tests/validation_runtime/uv.lock (0.11.1.dev0 -> 0.12.0). Base: main 07644784.

Changes since v0.11.0

• Raise SessionLostError when the WebSocket drops mid-episode #1536 Raise SessionLostError (new public exception, exported from openenv.core) when the WebSocket drops mid-episode instead of silently reconnecting to an unreset environment. New public API plus behavior change, so the proposed bump is minor (0.12.0) rather than patch (0.11.1).
• textarena_env: parse TEXTARENA_KW_* values as JSON #1530 textarena_env: parse TEXTARENA_KW_* values as JSON so numeric kwargs keep their type.
• chore(deps): bump authlib from 1.8.0 to 1.9.1 in /tests/validation_runtime #1538 (and chore(deps): bump authlib from 1.7.1 to 1.9.1 in /envs/websearch_env #1539 if merged before release) authlib 1.9.1 lock bumps (test/env locks only, not shipped).

Blockers / decisions

• Version decision for Ben: 0.12.0 (default, silence = 0.12.0) vs 0.11.1.
• Outstanding fork PRs need a maintainer Approve-and-run before CI can validate (e.g. Fix async pre-hook ordering in rubric containers #1543 rubric async pre-hook fix, fix(core): parse continued Dockerfile CMD instructions #1532, rubrics: reset child rubrics when a rubric is reset #1535, capture: share image history strings across turns to avoid quadratic memory #1534). They are not in the candidate.

State (automation)

• Last reviewed head: d5c2e22, release lock: none, TestPyPI: not yet run, tag: none.
• Merge with: --squash --subject "Release OpenEnv 0.12.0 (#N)" --match-head-commit <head>.