- Fixed TTSR violations during subagent execution aborting the entire subagent run; `#waitForPostPromptRecovery()` now awaits agent idle after TTSR/retry gates resolve, preventing `prompt()` from returning while fire-and-forget `agent.continue()` is still streaming.
- Added comprehensive test case verifying `prompt()` blocks until TTSR continuation with tool calls completes, preventing premature session disposal.
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