feat(processes): MCP create/list/get/update_process tools

Task 2 of #582. New mcp/tools/processes.py mirrors entities.py — tools wrap
notes_svc directly. get_process is the fire mechanism (returns the full prompt
via resolve_process; surfaces other_matches on an ambiguous name). Registered
in register_all.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_mcp_tool_processes.py

@@ -0,0 +1,91 @@
+"""Tests for MCP process tools — patches the service layer."""
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+from fabledassistant.mcp._context import _user_id_ctx
+
+
+@pytest.fixture(autouse=True)
+def _bind_user():
+    token = _user_id_ctx.set(7)
+    yield
+    _user_id_ctx.reset(token)
+
+
+def _fake_note(id=1, title="Drift Audit", note_type="process"):
+    n = MagicMock()
+    n.id = id
+    n.title = title
+    n.note_type = note_type
+    n.to_dict.return_value = {"id": id, "title": title, "note_type": note_type}
+    return n
+
+
+@pytest.mark.asyncio
+async def test_create_process_requires_title_and_body():
+    from fabledassistant.mcp.tools.processes import create_process
+    with pytest.raises(ValueError):
+        await create_process(title="", body="something")
+    with pytest.raises(ValueError):
+        await create_process(title="X", body="   ")
+
+
+@pytest.mark.asyncio
+async def test_create_process_sets_note_type():
+    created = _fake_note()
+    with patch("fabledassistant.services.notes.create_note",
+               AsyncMock(return_value=created)) as mock_create:
+        from fabledassistant.mcp.tools.processes import create_process
+        out = await create_process(title="Drift Audit", body="the prompt", tags=["audit"])
+    assert out["note_type"] == "process"
+    # the service was asked to create a process
+    assert mock_create.await_args.kwargs["note_type"] == "process"
+    assert mock_create.await_args.kwargs["title"] == "Drift Audit"
+
+
+@pytest.mark.asyncio
+async def test_get_process_returns_body_and_candidates():
+    note = _fake_note(id=7)
+    with patch("fabledassistant.services.notes.resolve_process",
+               AsyncMock(return_value=(note, [{"id": 9, "title": "Drift Audit Notes"}]))):
+        from fabledassistant.mcp.tools.processes import get_process
+        out = await get_process("drift")
+    assert out["id"] == 7
+    assert out["other_matches"] == [{"id": 9, "title": "Drift Audit Notes"}]
+
+
+@pytest.mark.asyncio
+async def test_get_process_not_found_raises():
+    with patch("fabledassistant.services.notes.resolve_process",
+               AsyncMock(return_value=(None, []))):
+        from fabledassistant.mcp.tools.processes import get_process
+        with pytest.raises(ValueError):
+            await get_process("missing")
+
+
+@pytest.mark.asyncio
+async def test_update_process_rejects_non_process_note():
+    plain = _fake_note(id=3, note_type="note")
+    with patch("fabledassistant.services.notes.get_note",
+               AsyncMock(return_value=plain)):
+        from fabledassistant.mcp.tools.processes import update_process
+        with pytest.raises(ValueError):
+            await update_process(process_id=3, title="x")
+
+
+def test_register_attaches_four_tools():
+    from fabledassistant.mcp.tools import processes
+    names: list[str] = []
+
+    class FakeMcp:
+        def tool(self, name):
+            names.append(name)
+            def deco(fn):
+                return fn
+            return deco
+
+    processes.register(FakeMcp())
+    assert set(names) == {
+        "list_processes", "create_process", "get_process", "update_process",
+    }