protocol: report session permission profiles (#18282)

## Why

Clients that observe `SessionConfigured` need the same canonical
permission view that app-server thread responses provide. Reporting the
profile in protocol events lets clients keep their local state
synchronized without reinterpreting legacy sandbox fields.

## What changed

This adds `permission_profile` to `SessionConfigured` and propagates it
through core, exec JSON output, MCP server messages, and TUI
history/widget handling.

## Verification

- `cargo test -p codex-tui permissions -- --nocapture`
- `cargo test -p codex-core --test all permissions_messages --
--nocapture`















































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[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/18282).
* #18288
* #18287
* #18286
* #18285
* #18284
* #18283
* __->__ #18282

codex-rs/mcp-server/src/outgoing_message.rs

@@ -305,6 +305,7 @@ mod tests {
                 approval_policy: AskForApproval::Never,
                 approvals_reviewer: codex_protocol::config_types::ApprovalsReviewer::User,
                 sandbox_policy: SandboxPolicy::new_read_only_policy(),
+                permission_profile: None,
                 cwd: test_path_buf("/home/user/project").abs(),
                 reasoning_effort: Some(ReasoningEffort::default()),
                 history_log_id: 1,
@@ -349,6 +350,7 @@ mod tests {
             approval_policy: AskForApproval::Never,
             approvals_reviewer: codex_protocol::config_types::ApprovalsReviewer::User,
             sandbox_policy: SandboxPolicy::new_read_only_policy(),
+            permission_profile: None,
             cwd: test_path_buf("/home/user/project").abs(),
             reasoning_effort: Some(ReasoningEffort::default()),
             history_log_id: 1,
@@ -418,6 +420,7 @@ mod tests {
             approval_policy: AskForApproval::Never,
             approvals_reviewer: codex_protocol::config_types::ApprovalsReviewer::User,
             sandbox_policy: SandboxPolicy::new_read_only_policy(),
+            permission_profile: None,
             cwd: test_path_buf("/home/user/project").abs(),
             reasoning_effort: Some(ReasoningEffort::default()),
             history_log_id: 1,