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After context compression (manual /compress or auto), run_agent's _compress_context ends the current session and creates a new continuation child session, mutating agent.session_id. The classic CLI held its own self.session_id that never resynced, so /status showed the ended parent, the exit-summary --resume hint pointed at a closed row, and any later end_session() call (from /resume <other> or /branch) targeted the wrong row AND overwrote the parent's 'compression' end_reason. This only affected the classic prompt_toolkit CLI. The gateway path was already fixed in PR #1160 (March 2026); --tui and ACP use different session plumbing and were unaffected. Changes: - cli.py::_manual_compress — sync self.session_id from self.agent.session_id after _compress_context, clear _pending_title - cli.py chat loop — same sync post-run_conversation for auto-compression - cli.py hermes -q single-query mode — same sync so stderr session_id output points at the continuation - hermes_state.py::end_session — guard UPDATE with 'ended_at IS NULL' so the first end_reason wins; reopen_session() remains the explicit escape hatch for re-ending a closed row Tests: - 3 new in tests/cli/test_manual_compress.py (split sync, no-op guard, pending_title behavior) - 2 new in tests/test_hermes_state.py (preserve compression end_reason on double-end; reopen-then-re-end still works) Closes #12483. Credits @steve5636 for the same-day bug report and @dieutx for PR #3529 which proposed the CLI sync approach.