feat: add experimental additionalPermissions to v2 command execution approval requests (#12737)
This adds additionalPermissions to the app-server v2
item/commandExecution/requestApproval payload as an experimental field.
The field is now exposed on CommandExecutionRequestApprovalParams and is
populated from the existing core approval event when a command requests
additional sandbox permissions.
This PR also contains changes to make server requests to support
experiment API.
A real app server test client test:
sample payload with experimental flag off:
```
{
< "id": 0,
< "method": "item/commandExecution/requestApproval",
< "params": {
< "command": "/bin/zsh -lc 'mkdir -p ~/some/test && touch ~/some/test/file'",
< "commandActions": [
< {
< "command": "mkdir -p '~/some/test'",
< "type": "unknown"
< },
< {
< "command": "touch '~/some/test/file'",
< "type": "unknown"
< }
< ],
< "cwd": "/Users/celia/code/codex/codex-rs",
< "itemId": "call_QLp0LWkQ1XkU6VW9T2vUZFWB",
< "proposedExecpolicyAmendment": [
< "mkdir",
< "-p",
< "~/some/test"
< ],
< "reason": "Do you want to allow creating ~/some/test/file outside the workspace?",
< "threadId": "019c9309-e209-7d82-a01b-dcf9556a354d",
< "turnId": "019c9309-e27a-7f33-834f-6011e795c2d6"
< }
< }
```
with experimental flag on:
```
< {
< "id": 0,
< "method": "item/commandExecution/requestApproval",
< "params": {
< "additionalPermissions": {
< "fileSystem": null,
< "macos": null,
< "network": true
< },
< "command": "/bin/zsh -lc 'install -D /dev/null ~/some/test/file'",
< "commandActions": [
< {
< "command": "install -D /dev/null '~/some/test/file'",
< "type": "unknown"
< }
< ],
< "cwd": "/Users/celia/code/codex/codex-rs",
< "itemId": "call_K3U4b3dRbj3eMCqslmncbGsq",
< "proposedExecpolicyAmendment": [
< "install",
< "-D"
< ],
< "reason": "Do you want to allow creating the file at ~/some/test/file outside the workspace sandbox?",
< "threadId": "019c9303-3a8e-76e1-81bf-d67ac446d892",
< "turnId": "019c9303-3af1-7143-88a1-73132f771234"
< }
< }
```
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