[ana52070]

What was wrong

In #1043, Antigravity's native interaction questions (interaction_<hex>) were bridged into Codeg's interactive question card, avoiding permission traps and restoring user selections in session history.

However, try_bridge_antigravity_ask and take_antigravity_answered_close strictly checked state.read().await.agent_type == AgentType::Antigravity. When running Antigravity under a custom agent configuration (such as custom:antigravity-b), the agent type evaluates to AgentType::Custom(...). Consequently:

1. Native ask_question tool calls were rejected by try_bridge_antigravity_ask and fell back to generic tool permission approval prompts ("Allow Once / Allow Always / Deny").
2. The closing update frame (rawOutput: "Response received") was not intercepted by take_antigravity_answered_close, potentially overwriting answers with "no selection".

The change

• Bridge Gating Alignment: In src-tauri/src/acp/connection.rs, updated try_bridge_antigravity_ask to allow both AgentType::Antigravity and AgentType::Custom(_) alongside is_antigravity_interaction_id, enabling custom agents running Antigravity while keeping other built-in agents (e.g. Codex) guarded against look-alike tool call IDs.
• Closing Frame Drop: Updated take_antigravity_answered_close to recognize and consume answered interaction closures across both built-in AgentType::Antigravity and custom agents running Antigravity (AgentType::Custom(_)).
• Unit Tests:
  • Extended antigravity_interaction_round_trip_preserves_choice_and_gates to verify round-trip question bridging on AgentType::Custom("antigravity-b").
  • Extended antigravity_interaction_frames_do_not_overwrite_the_bridged_card to ensure custom agent interaction updates are properly handled.

Tests

• cargo check --bin codeg: Passed with 0 errors.
• cargo clippy --bin codeg -- -D warnings: Passed with 0 warnings.
• cargo check --no-default-features --features server-bin --bin codeg-server: Passed with 0 errors.
• cargo check --no-default-features --features mcp-bin --bin codeg-mcp: Passed with 0 errors.