core tests: build user turns from permission profiles (#20011)

## Summary
- Add `turn_permission_fields()` so tests that construct `Op::UserTurn`
directly can provide a canonical `PermissionProfile` while still filling
the required legacy `sandbox_policy` compatibility field.
- Migrate direct user-turn construction in core integration tests from
`SandboxPolicy::DangerFullAccess` to `PermissionProfile::Disabled`.
- Continue reducing direct `SandboxPolicy` usage in
`codex-rs/core/tests`, from 41 files after #20010 to 32 files in this
PR.

## Testing
- `cargo check -p codex-core --tests`
- `just fmt`
- `just fix -p core_test_support`
- `just fix -p codex-core`

codex-rs/core/tests/suite/live_reload.rs

@@ -8,10 +8,10 @@ use std::time::Duration;
 use anyhow::Result;
 use codex_config::config_toml::ProjectConfig;
 use codex_protocol::config_types::TrustLevel;
+use codex_protocol::models::PermissionProfile;
 use codex_protocol::protocol::AskForApproval;
 use codex_protocol::protocol::EventMsg;
 use codex_protocol::protocol::Op;
-use codex_protocol::protocol::SandboxPolicy;
 use codex_protocol::user_input::UserInput;
 use core_test_support::responses;
 use core_test_support::responses::ResponsesRequest;
@@ -19,6 +19,7 @@ use core_test_support::responses::mount_sse_sequence;
 use core_test_support::responses::start_mock_server;
 use core_test_support::test_codex::TestCodex;
 use core_test_support::test_codex::test_codex;
+use core_test_support::test_codex::turn_permission_fields;
 use core_test_support::wait_for_event;
 use tokio::time::timeout;
 
@@ -46,6 +47,8 @@ fn contains_skill_body(request: &ResponsesRequest, skill_body: &str) -> bool {
 
 async fn submit_skill_turn(test: &TestCodex, skill_path: PathBuf, prompt: &str) -> Result<()> {
     let session_model = test.session_configured.model.clone();
+    let (sandbox_policy, permission_profile) =
+        turn_permission_fields(PermissionProfile::Disabled, test.cwd_path());
     test.codex
         .submit(Op::UserTurn {
             environments: None,
@@ -63,8 +66,8 @@ async fn submit_skill_turn(test: &TestCodex, skill_path: PathBuf, prompt: &str)
             cwd: test.cwd_path().to_path_buf(),
             approval_policy: AskForApproval::Never,
             approvals_reviewer: None,
-            sandbox_policy: SandboxPolicy::DangerFullAccess,
-            permission_profile: None,
+            sandbox_policy,
+            permission_profile,
             model: session_model,
             effort: None,
             summary: None,