Summary

Phase 2 of the custom slash command lifecycle / hooks architecture stack.

This is intentionally stacked on the Phase 1 branch. Upstream PR Hmbown#2326 contains Phase 1 and targets Hmbown/CodeWhale:main; this fork-local draft keeps the Phase 2 diff isolated until Phase 1 is merged or the Phase 1 branch is available in the upstream repository.

Scope:

• thread HookExecutor through command-triggered engine turns
• run ToolCallBefore hooks before tool execution
• treat hook exit code 2 as a tool-denial signal
• preserve Phase 1 allowed-tools enforcement as the earlier policy gate

Verification

• cargo check -p codewhale-tui --bin codewhale-tui
• cargo test -p codewhale-tui --bin codewhale-tui hook_gate -- --nocapture
• cargo test -p codewhale-tui --bin codewhale-tui allowed_tools -- --nocapture
• cargo test -p codewhale-tui --bin codewhale-tui review_regression -- --nocapture

Paulo Aboim Pinto