Rename the delegate and consultant roles to helper and expert

Architecture L9's role names, for the two roles with a direct
counterpart: the delegation role is now 'helper' and the ask_expert role
'expert', in RoleMap, configuration (roles.helper, roles.expert),
recorded events and tests. 'planner' and 'executor' stay distinct for
now; they become 'driver' when the new loop merges them (Development
Plan M2.3).

Configurations must rename their keys: nisse-dev.example.yaml and
tests/integration/nisse-test.yaml are updated here.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

nisse-dev/tests/test_delegation.py

@@ -385,9 +385,7 @@ def test_clean_cut_after_a_tool_result_is_resumable(
     repo.checkout_new_branch("d")
     (repo.root / "partial.py").write_text("x")
     repo.commit_all("partial work")
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(ToolCall(call_id="c", tool="write_file", arguments={}))
     store.append_event(ToolResult(call_id="c", result="wrote", success=True))
     intent = pending_delegation_intent(store)
@@ -400,9 +398,7 @@ def test_dangling_tool_call_gates(
 ) -> None:
     # The effect of the call is unknown and not verifiable by inspection.
     repo.checkout_new_branch("d")
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(ToolCall(call_id="c", tool="run_command", arguments={}))
     intent = pending_delegation_intent(store)
 
@@ -412,9 +408,7 @@ def test_dangling_tool_call_gates(
 def test_missing_branch_means_nothing_started(
     store: StateStore, ws: Workspace, repo: GitRepo
 ) -> None:
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(ToolResult(call_id="c", result="ok", success=True))
     intent = pending_delegation_intent(store, branch="never-created")
 
@@ -425,9 +419,7 @@ def test_a_finished_delegation_settles_rather_than_resumes(
     store: StateStore, ws: Workspace, repo: GitRepo
 ) -> None:
     repo.checkout_new_branch("d")
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(
         DelegationCompleted(
             handback="done",
@@ -448,9 +440,7 @@ def test_resume_continues_the_same_delegation(
     # Interrupt after one turn, then resume: no second delegation_started,
     # because L7 defines a session as the delegation, not the process.
     repo.checkout_new_branch("d")
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(ToolResult(call_id="c", result="wrote a.py", success=True))
     intent = pending_delegation_intent(store)
 
@@ -484,9 +474,7 @@ def test_recover_resumes_a_clean_cut_with_a_notice(
     store: StateStore, ws: Workspace, repo: GitRepo
 ) -> None:
     repo.checkout_new_branch("d")
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(ToolResult(call_id="c", result="wrote a.py", success=True))
     pending_delegation_intent(store)
     notices: list[str] = []
@@ -505,9 +493,7 @@ def test_recover_settles_a_finished_delegation_without_resuming(
     store: StateStore, ws: Workspace, repo: GitRepo
 ) -> None:
     repo.checkout_new_branch("d")
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(
         DelegationCompleted(
             handback="done",
@@ -539,9 +525,7 @@ def test_recover_leaves_an_unclean_cut_for_the_boot_gate(
     store: StateStore, ws: Workspace, repo: GitRepo
 ) -> None:
     repo.checkout_new_branch("d")
-    store.append_event(
-        DelegationStarted(brief="b", role="delegate", model="m", caps={})
-    )
+    store.append_event(DelegationStarted(brief="b", role="helper", model="m", caps={}))
     store.append_event(ToolCall(call_id="c", tool="run_command", arguments={}))
     pending_delegation_intent(store)