fix(codex): recover app-server text without completion

[ooiuuii]

Fixes #58432

Summary

• accept a completed Codex app-server assistant message as the terminal result when the turn deadline arrives without turn/completed
• keep the existing timeout/interrupt/retire path for turns that never produced assistant text or already reported an error
• add regression coverage for the missing-completion path

Why

CodexAppServerSession.run_turn() already records completed agentMessage items into result.final_text and projected_messages. If the subprocess omits turn/completed afterward, the previous deadline path still marked the turn as interrupted and timed out, losing the successful completion state.

Proof

• uv run --extra dev python -m py_compile agent\transports\codex_app_server_session.py tests\agent\transports\test_codex_app_server_session.py
• $env:TMP='F:\Codex\tmp\pytest-hermes'; $env:TEMP='F:\Codex\tmp\pytest-hermes'; uv run --extra dev pytest tests\agent\transports\test_codex_app_server_session.py -k "final_agent_message_without_turn_completed or deadline_marks_session_for_retirement or post_tool_quiet_watchdog or turn_aborted_marker" -q -> 4 passed, 55 deselected
• $env:TMP='F:\Codex\tmp\pytest-hermes'; $env:TEMP='F:\Codex\tmp\pytest-hermes'; uv run --extra dev pytest tests\agent\transports\test_codex_app_server_session.py -q -> 59 passed

Duplicate search

Checked open and closed Hermes PRs/issues for codex app-server missing turn completed final response, codex app-server turn completed timeout assistant, turn/completed codex final_text, and turn timed out after codex final_text. Existing matches were older Codex Responses stream issues, not this app-server session completion path.