kiro-cli --tui crashes on macOS 26 (Tahoe) - bundled bun 1.3.10 SIGTRAP in pthread_jit_write_protect_np

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

macOS 26.3.1 (25D2128)

### Expected behaviour

The embedded bun 1.3.10 runtime crashes with `EXC_BREAKPOINT` / `SIGTRAP` in `pthread_jit_write_protect_np`. This JIT write protection API changed in macOS 26. Confirmed via macOS DiagnosticReports:

### Actual behaviour

`kiro-cli --tui` silently exits with code 1 on macOS 26.3.1 (Tahoe, Build 25D2128) on Apple Silicon (Mac16,7). No output is produced, even with `--verbose`.

### Steps to reproduce

Run kiro-cli --tui on macOS 26.3.1

### Environment

```yaml

[q-details]
version = "1.29.4"
hash = "b5dcf43e402cddd5a6507bf16fc9daba86f48c4e"
date = "2026-04-06T21:44:29.987555Z (2h ago)"
variant = "full"

[system-info]
os = "macOS 26.3.1 (25D2128)"
chip = "Apple M4 Pro"
total-cores = 14
memory = "48.00 GB"

[environment]
cwd = "/Users/USER"
cli-path = "/Users/USER"
os = "Mac"
shell-path = "/bin/bash"
shell-version = "3.2.57"
terminal = "Hyper"
install-method = "unknown"

[env-vars]
PATH = "/Users/USER/.local/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/pmk/env/global/bin:/Library/Apple/usr/bin:/opt/homebrew/bin:/Users/USER/.local/bin"
QTERM_SESSION_ID = "6d617707dd18456f85260d74187e2975"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.29.4"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "co.zeit.hyper"
```