The qa_pty integration tests booted the canonical TUI via
`Harness::cargo_bin("deepseek-tui")`. After the previous commit
renamed the canonical bin to `codewhale-tui` and made `deepseek-tui`
a tiny deprecation shim that forwards to it via PATH, those tests
launched the shim and hung waiting for a TUI frame because the
sealed PATH in the test sandbox has no `codewhale-tui`.
Point the harness at `cargo_bin("codewhale-tui")` directly. Also
add a `CARGO_BIN_EXE_codewhale-tui` compile-time fallback in the
harness so older Cargo versions still work, alongside the existing
legacy `deepseek-tui` fallback.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Hunter Bown
8da9fb7d52