fix(sdk): _TERMINAL_TOOLS uses current gateway verb names

Smoke-7 evidence: every agent's first successful i_am_idle was followed
by a stop-hook error "you stopped without calling a terminal tool"
even though i_am_idle had just succeeded.

Root cause: agent_sdk._TERMINAL_TOOLS still held pre-gateway names
(roboco_agent_idle, roboco_task_submit_qa, ...). /terminal/tool_recorded
strips the `mcp__roboco-flow__` prefix and stores 'i_am_idle' — the
membership check against {'roboco_agent_idle', ...} never matched, so
had_terminal_recently() always returned False, and the stop hook nagged
every clean exit. Wasted ~2-3 turns per agent + burned stop_allowance.

Fix: rebuilt _TERMINAL_TOOLS with the current gateway verb names:
i_am_idle, i_am_done, i_am_blocked, i_documented, unclaim, pass, fail,
complete, submit_up, escalate_up, escalate_to_ceo.

7 new tests pin:
- every role's terminal verbs are recognized
- pre-gateway names are NOT in the set
- _SessionState.had_terminal_recently() returns True after i_am_idle

tests/unit/agent_sdk/test_terminal_tools_gateway_names.py

@@ -0,0 +1,79 @@
+"""Smoke-7: SDK's _TERMINAL_TOOLS matches the current gateway verb names.
+
+Original bug: the set still held pre-gateway names (roboco_agent_idle,
+roboco_task_submit_qa, ...). Tools recorded via /terminal/tool_recorded
+get their `mcp__roboco-flow__` prefix stripped, so `i_am_idle` lands in
+recent_tools — but the membership check against the old names always
+returned False. The stop hook then nagged every agent on every clean
+exit, wasting tokens and burning the stop-allowance counter.
+"""
+
+from __future__ import annotations
+
+from roboco.agent_sdk.server import _TERMINAL_TOOLS, _SessionState
+
+
+def test_idle_is_terminal() -> None:
+    """i_am_idle (the universal clean-exit verb) must be terminal."""
+    assert "i_am_idle" in _TERMINAL_TOOLS
+
+
+def test_developer_terminal_verbs() -> None:
+    """A developer's clean-exit verbs must all be terminal."""
+    for verb in ("i_am_done", "i_am_blocked", "unclaim"):
+        assert verb in _TERMINAL_TOOLS, f"{verb} missing from _TERMINAL_TOOLS"
+
+
+def test_qa_terminal_verbs() -> None:
+    """QA's pass/fail verdicts and clean-exit verbs must all be terminal."""
+    for verb in ("pass", "fail", "i_am_idle"):
+        assert verb in _TERMINAL_TOOLS
+
+
+def test_pm_terminal_verbs() -> None:
+    """PM handoff verbs (complete, submit_up, escalate_*) must be terminal."""
+    for verb in (
+        "complete",
+        "submit_up",
+        "escalate_up",
+        "escalate_to_ceo",
+    ):
+        assert verb in _TERMINAL_TOOLS
+
+
+def test_documenter_terminal_verbs() -> None:
+    """Documenter's i_documented + i_am_idle must be terminal."""
+    for verb in ("i_documented", "i_am_idle"):
+        assert verb in _TERMINAL_TOOLS
+
+
+def test_pre_gateway_names_not_present() -> None:
+    """Pre-gateway names must NOT be in the set (they never match recent_tools)."""
+    pre_gateway = {
+        "roboco_agent_idle",
+        "roboco_task_submit_qa",
+        "roboco_task_qa_pass",
+        "roboco_task_qa_fail",
+        "roboco_task_complete",
+        "roboco_task_docs_complete",
+        "roboco_task_escalate",
+        "roboco_task_escalate_to_ceo",
+    }
+    leaked = pre_gateway & _TERMINAL_TOOLS
+    assert not leaked, (
+        f"Pre-gateway names leaked into _TERMINAL_TOOLS: {sorted(leaked)}. "
+        "These never match the suffix-stripped MCP verb names recorded by "
+        "/terminal/tool_recorded."
+    )
+
+
+def test_had_terminal_recently_after_i_am_idle() -> None:
+    """Recording i_am_idle marks the session as having terminal recently."""
+    state = _SessionState()
+    # Mirrors the SDK's suffix-strip on /terminal/tool_recorded.
+    state.recent_tools.append("i_am_idle")
+    state.last_tool = "i_am_idle"
+    assert state.had_terminal_recently() is True, (
+        "Stop hook reads had_terminal_recently to decide if a Stop is graceful. "
+        "After i_am_idle the agent's exit IS graceful — must return True."
+    )