Share detailed tool context usage

### 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 15.6.0 (24G84)

### Expected behaviour

When using multiple MCPs and MCPs may have many tools each, the context window from loading the tools can get quite large. The request is to include individual tools context usage in `/context show` method at the tool level (not only at the MCP level).

### Actual behaviour

`/context show` only references files context usage

### Steps to reproduce

_No response_

### Environment

```yaml

[q-details]
version = "1.14.1"
hash = "405e74d10634890cbb26850966d951f87bd5d169"
date = "2025-08-21T19:01:34.398819Z (23h ago)"
variant = "full"

[system-info]
os = "macOS 15.6.0 (24G84)"
chip = "Apple M1 Pro"
total-cores = 10
memory = "32.00 GB"

[environment]
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "iTerm 2"
install-method = "unknown"

[env-vars]
QTERM_SESSION_ID = "4b7819f8760041969678ddb2ebe73bc3"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.14.1"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.googlecode.iterm2"
```