fix(gateway): name what the /status token number actually is

Sharpen the label from 'Session usage (cumulative)' to 'Cumulative API
tokens (re-sent each call)'. The number is real provider-reported usage
summed across every API call in the session — not context size. In an
agentic loop the same context is re-sent each iteration, so a one-hour
tool-heavy session legitimately reaches tens of millions of tokens. The
new label explains the magnitude so users stop reading it as a bug or as
a total across all sessions.

tests/gateway/test_status_command.py

@@ -97,7 +97,7 @@ async def test_status_command_reports_running_agent_without_interrupt(monkeypatc
     result = await runner._handle_message(_make_event("/status"))
 
     assert "**Session ID:** `sess-1`" in result
-    assert "**Session usage (cumulative):** 321" in result
+    assert "**Cumulative API tokens (re-sent each call):** 321" in result
     assert "**Agent Running:** Yes ⚡" in result
     assert "**Title:**" not in result
     running_agent.interrupt.assert_not_called()
@@ -150,7 +150,7 @@ async def test_status_command_reads_token_totals_from_session_db():
     result = await runner._handle_message(_make_event("/status"))
 
     # 1000 + 250 + 500 + 100 + 50 = 1,900
-    assert "**Session usage (cumulative):** 1,900" in result
+    assert "**Cumulative API tokens (re-sent each call):** 1,900" in result
 
 
 @pytest.mark.asyncio
@@ -171,7 +171,7 @@ async def test_status_command_tokens_zero_when_session_db_row_missing():
 
     result = await runner._handle_message(_make_event("/status"))
 
-    assert "**Session usage (cumulative):** 0" in result
+    assert "**Cumulative API tokens (re-sent each call):** 0" in result
 
 
 @pytest.mark.asyncio