chore(release): 0.12.0

[zhanghanduo]

Summary

Release PR for 0.12.0, generated with scripts/prepare_release.py + uv lock.

• Consumes the pending fragments: fix(loop): make text-mode tool_call ids unique across the history #40 (fix), fix(observers): make TaskBoardObserver critical so its reminder lands #42 (fix), feat(api): export helpers that host facades re-export #43 (feature) → MINOR bump.
• Folds in 0.11.2. main already carried version = "0.11.2" and a [0.11.2] CHANGELOG section for fix(providers): treat an empty OpenAI api_key as unset #41, but v0.11.2 was never tagged or published to PyPI. Its entry moves into 0.12.0 under Fixed, and the orphan section is removed, so the changelog lists only versions that exist on PyPI. The PyPI 0.11.2 number stays unused.

0.12.0 notes

Added

• loop_types.wall_deadline_remaining_s in __all__; public model_profile.to_openai_tool_calls (old private name kept as an alias). (feat(api): export helpers that host facades re-export #43)

Fixed

• Text-mode tool-call IDs are now unique across turns and resumed histories (call_{turn}_{idx}_{8 hex}). Consumers asserting exact synthesized IDs must accept the new shape. (fix(loop): make text-mode tool_call ids unique across the history #40)
• Empty api_key on OpenAIClient / OpenAIResponsesClient falls back to OPENAI_API_KEY. (fix(providers): treat an empty OpenAI api_key as unset #41)
• TaskBoardObserver is critical, so its reminder reaches the next turn. (fix(observers): make TaskBoardObserver critical so its reminder lands #42)

Test plan

• python3 scripts/check_version_bump.py --base origin/main → Release validated: 0.11.2 -> 0.12.0
• ruff, pyright agent_core, full pytest -q (1601 passed)
• uv build produces apodex_agent_core-0.12.0 wheel + sdist
• After merge: git tag -a v0.12.0 -m 'AgentCore 0.12.0' && git push origin v0.12.0 (publishes to PyPI)

🤖 Generated with Claude Code