fix: use session_key instead of chat_id for adapter interrupt lookups

* fix: use session_key instead of chat_id for adapter interrupt lookups

monitor_for_interrupt() in _run_agent was using source.chat_id to query
the adapter's has_pending_interrupt() and get_pending_message() methods.
But the adapter stores interrupt events under build_session_key(source),
which produces a different string (e.g. 'agent:main:telegram:dm' vs '123456').

This key mismatch meant the interrupt was never detected through the
adapter path, which is the only active interrupt path for all adapter-based
platforms (Telegram, Discord, Slack, etc.). The gateway-level interrupt
path (in dispatch_message) is unreachable because the adapter intercepts
the 2nd message in handle_message() before it reaches dispatch_message().

Result: sending a new message while subagents were running had no effect —
the interrupt was silently lost.

Fix: replace all source.chat_id references in the interrupt-related code
within _run_agent() with the session_key parameter, which matches the
adapter's storage keys.

Also adds regression tests verifying session_key vs chat_id consistency.

* debug: add file-based logging to CLI interrupt path

Temporary instrumentation to diagnose why message-based interrupts
don't seem to work during subagent execution. Logs to
~/.hermes/interrupt_debug.log (immune to redirect_stdout).

Two log points:
1. When Enter handler puts message into _interrupt_queue
2. When chat() reads it and calls agent.interrupt()

This will reveal whether the message reaches the queue and
whether the interrupt is actually fired.

cli.py

@@ -3608,6 +3608,19 @@ class HermesCLI:
                                 continue
                             print(f"\n⚡ New message detected, interrupting...")
                             self.agent.interrupt(interrupt_msg)
+                            # Debug: log to file (stdout may be devnull from redirect_stdout)
+                            try:
+                                import pathlib as _pl
+                                _dbg = _pl.Path.home() / ".hermes" / "interrupt_debug.log"
+                                with open(_dbg, "a") as _f:
+                                    import time as _t
+                                    _f.write(f"{_t.strftime('%H:%M:%S')} interrupt fired: msg={str(interrupt_msg)[:60]!r}, "
+                                             f"children={len(self.agent._active_children)}, "
+                                             f"parent._interrupt={self.agent._interrupt_requested}\n")
+                                    for _ci, _ch in enumerate(self.agent._active_children):
+                                        _f.write(f"  child[{_ci}]._interrupt={_ch._interrupt_requested}\n")
+                            except Exception:
+                                pass
                             break
                     except queue.Empty:
                         pass  # Queue empty or timeout, continue waiting
@@ -3877,6 +3890,16 @@ class HermesCLI:
                 payload = (text, images) if images else text
                 if self._agent_running and not (text and text.startswith("/")):
                     self._interrupt_queue.put(payload)
+                    # Debug: log to file when message enters interrupt queue
+                    try:
+                        import pathlib as _pl
+                        _dbg = _pl.Path.home() / ".hermes" / "interrupt_debug.log"
+                        with open(_dbg, "a") as _f:
+                            import time as _t
+                            _f.write(f"{_t.strftime('%H:%M:%S')} ENTER: queued interrupt msg={str(payload)[:60]!r}, "
+                                     f"agent_running={self._agent_running}\n")
+                    except Exception:
+                        pass
                 else:
                     self._pending_input.put(payload)
                 event.app.current_buffer.reset(append_to_history=True)