MCP registry parse error blocks all MCP operations in kiro-cli

### 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

Linux 6.8.0-124-generic - Ubuntu 22.04.5 LTS

### Expected behaviour

- MCP servers should load in CLI chat sessions
- Locally-defined explicit servers (command/args) should work regardless of registry availability
- Registry parse failures should not block the entire MCP system

### Actual behaviour

- The CLI connects to q.us-east-1.amazonaws.com to fetch registry data
- The response JSON is missing a value field the CLI expects
- This failure blocks ALL MCP operations — even locally-defined servers that don't need the registry

### Steps to reproduce

- Ran kiro-cli doctor — no MCP-related issues found
- kiro-cli restart not available (minimal install)
- Verbose logs (kiro-cli mcp list -vvv) confirm successful TLS connection to q.us-east-1.amazonaws.com but JSON
deserialization fails
- Kiro IDE parses the same registry response without issues — suggests the CLI parser is out of date with the
registry response schema

### Environment

```yaml

[q-details]
version = "2.5.0"
hash = "9595f8ef1891859828df3785e926266512d6762b"
date = "2026-05-28T23:14:24.80197Z (4d ago)"
variant = "minimal"

[system-info]
chip = "13th Gen Intel(R) Core(TM) i9-13950HX"
total-cores = 24
memory = "125.49 GB"

[system-info.os.linux]
kernel_version = "6.8.0-124-generic"
id = "ubuntu"
name = "Ubuntu"
pretty_name = "Ubuntu 22.04.5 LTS"
version_id = "22.04"
version = "22.04.5 LTS (Jammy Jellyfish)"

[environment]
cwd = "/home/fgutier2"
cli-path = "/home/fgutier2"
os = "Linux"
shell-path = "/usr/bin/bash"
shell-version = "5.1.16"
install-method = "unknown"

[env-vars]
DISPLAY = ":0"
GTK_IM_MODULE = "ibus"
PATH = "/home/fgutier2/bin:/home/fgutier2/.nvm/versions/node/v20.20.2/bin:/home/fgutier2/.local/bin:/home/fgutier2/kwdesktop/bin:/home/fgutier2/kwbuildtools2/bin:/home/fgutier2/.local/bin:/home/fgutier2/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/fgutier2/.local/bin:/home/fgutier2/.fzf/bin"
QT_IM_MODULE = "ibus"
Q_SET_PARENT_CHECK = "1"
SHELL = "/usr/bin/bash"
TERM = "xterm-256color"
XDG_CURRENT_DESKTOP = "KDE"
XDG_SESSION_DESKTOP = "KDE"
XDG_SESSION_TYPE = "x11"
XMODIFIERS = "@im=ibus"
```