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.

tests/run_interrupt_test.py

@@ -0,0 +1,141 @@
+#!/usr/bin/env python3
+"""Run a real interrupt test with actual AIAgent + delegate child.
+
+Not a pytest test — runs directly as a script for live testing.
+"""
+
+import threading
+import time
+import sys
+import os
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from unittest.mock import MagicMock, patch
+from run_agent import AIAgent, IterationBudget
+from tools.delegate_tool import _run_single_child
+from tools.interrupt import set_interrupt, is_interrupted
+
+set_interrupt(False)
+
+# Create parent agent (minimal)
+parent = AIAgent.__new__(AIAgent)
+parent._interrupt_requested = False
+parent._interrupt_message = None
+parent._active_children = []
+parent.quiet_mode = True
+parent.model = "test/model"
+parent.base_url = "http://localhost:1"
+parent.api_key = "test"
+parent.provider = "test"
+parent.api_mode = "chat_completions"
+parent.platform = "cli"
+parent.enabled_toolsets = ["terminal", "file"]
+parent.providers_allowed = None
+parent.providers_ignored = None
+parent.providers_order = None
+parent.provider_sort = None
+parent.max_tokens = None
+parent.reasoning_config = None
+parent.prefill_messages = None
+parent._session_db = None
+parent._delegate_depth = 0
+parent._delegate_spinner = None
+parent.tool_progress_callback = None
+parent.iteration_budget = IterationBudget(max_total=100)
+parent._client_kwargs = {"api_key": "test", "base_url": "http://localhost:1"}
+
+child_started = threading.Event()
+result_holder = [None]
+
+
+def run_delegate():
+    with patch("run_agent.OpenAI") as MockOpenAI:
+        mock_client = MagicMock()
+
+        def slow_create(**kwargs):
+            time.sleep(3)
+            resp = MagicMock()
+            resp.choices = [MagicMock()]
+            resp.choices[0].message.content = "Done"
+            resp.choices[0].message.tool_calls = None
+            resp.choices[0].message.refusal = None
+            resp.choices[0].finish_reason = "stop"
+            resp.usage.prompt_tokens = 100
+            resp.usage.completion_tokens = 10
+            resp.usage.total_tokens = 110
+            resp.usage.prompt_tokens_details = None
+            return resp
+
+        mock_client.chat.completions.create = slow_create
+        mock_client.close = MagicMock()
+        MockOpenAI.return_value = mock_client
+
+        original_init = AIAgent.__init__
+
+        def patched_init(self_agent, *a, **kw):
+            original_init(self_agent, *a, **kw)
+            child_started.set()
+
+        with patch.object(AIAgent, "__init__", patched_init):
+            try:
+                result = _run_single_child(
+                    task_index=0,
+                    goal="Test slow task",
+                    context=None,
+                    toolsets=["terminal"],
+                    model="test/model",
+                    max_iterations=5,
+                    parent_agent=parent,
+                    task_count=1,
+                    override_provider="test",
+                    override_base_url="http://localhost:1",
+                    override_api_key="test",
+                    override_api_mode="chat_completions",
+                )
+                result_holder[0] = result
+            except Exception as e:
+                print(f"ERROR in delegate: {e}")
+                import traceback
+                traceback.print_exc()
+
+
+print("Starting agent thread...")
+agent_thread = threading.Thread(target=run_delegate, daemon=True)
+agent_thread.start()
+
+started = child_started.wait(timeout=10)
+if not started:
+    print("ERROR: Child never started")
+    sys.exit(1)
+
+time.sleep(0.5)
+
+print(f"Active children: {len(parent._active_children)}")
+for i, c in enumerate(parent._active_children):
+    print(f"  Child {i}: _interrupt_requested={c._interrupt_requested}")
+
+t0 = time.monotonic()
+parent.interrupt("User typed a new message")
+print(f"Called parent.interrupt()")
+
+for i, c in enumerate(parent._active_children):
+    print(f"  Child {i} after interrupt: _interrupt_requested={c._interrupt_requested}")
+print(f"Global is_interrupted: {is_interrupted()}")
+
+agent_thread.join(timeout=10)
+elapsed = time.monotonic() - t0
+print(f"Agent thread finished in {elapsed:.2f}s")
+
+result = result_holder[0]
+if result:
+    print(f"Status: {result['status']}")
+    print(f"Duration: {result['duration_seconds']}s")
+    if elapsed < 2.0:
+        print("✅ PASS: Interrupt detected quickly!")
+    else:
+        print(f"❌ FAIL: Took {elapsed:.2f}s — interrupt was too slow or not detected")
+else:
+    print("❌ FAIL: No result!")
+
+set_interrupt(False)