v0.3.0

Changes

• Enable CardKit 2.0 by default for Codex-generated JSON 2.0 cards.
• Guide Codex to generate form cards with form and multi_select_static instead of unsupported checkbox_group.
• Convert legacy checkbox_group test cards into CardKit 2.0 form cards before delivery.
• Stamp CardKit submit buttons so form submissions resume the same Codex session.
• Update docs and troubleshooting for CardKit permissions and unsupported card blocks.

Verification

• python3 -m unittest -v test_feishu_codex_bridge.py
• python3 -m py_compile feishu_codex_bridge.py test_feishu_codex_bridge.py
• git diff --check
• Local runtime deployed with FEISHU_CARDKIT_ENABLED=1 and a CardKit 2.0 multi-select test card sent successfully.