Add managed command checkpoints requiring fresh human approval (#58045)

## Why

Managed command policies need to require a human decision independently of automatic review, hook allowances, and saved approvals.

## What changed

- Support `decision = "prompt-user"` in managed `requirements.toml` prefix rules, requiring a fresh, one-time human decision for matching commands.
- Add experimental `humanCommand` approval requests for clients advertising both `experimentalApi` and `requiredHumanApproval`. Accept only `accept`, `decline`, or `cancel`; reject commands when no capable client is available.
- Restrict responses to capable clients that received the request, and replay pending prompts to compatible clients on reconnect.
- Enable the capability in the TUI and update protocol schemas and client bindings.

## Testing

Add coverage for fresh decisions overriding saved allowances, hook allowances, and automatic review, plus child-thread approval routing and rejection of responses from incompatible or unrelated clients.

GitOrigin-RevId: 0b95ff6aab7f8a04b7298c8a4329d1fddf6a603e

codex-rs/app-server-protocol/schema/json/ClientRequest.json

@@ -1760,6 +1760,10 @@
           "default": false,
           "description": "Opt into `attestation/generate` requests for upstream `x-oai-attestation`.",
           "type": "boolean"
+        },
+        "requiredHumanApproval": {
+          "description": "Present `humanCommand` approvals to a person and return only a one-time decision. Requires `experimentalApi`. Pending requests can be replayed to compatible clients.",
+          "type": "boolean"
         }
       },
       "type": "object"