Roles, capability profiles and help on the new loop (M2.6)

- roles.driver (unset: the planner's model) and roles.classifier (unset:
  the expert's); the mapping is pinned when an item opens, and the driver
  and the go-ahead reader run on the item's own (L9).
- profiles: in configuration (tools, strengths, weaknesses), used in
  briefings: the driver's instructions say what its helper and expert are
  good at, the helper's brief who reads its handback; never a model name.
- delegate(task) and ask_expert(question) for the driver. A helper works
  on a branch off the milestone's; on a handback its work comes back as
  uncommitted changes, otherwise it is discarded, so harness branches
  never hold commits only the clone has. ask_expert keeps its budget.
- Triggers: failure_limit failed commands in a row (Driver's new "stuck"
  outcome) or the turn cap, mid-milestone, call a helper in once per
  milestone; if it fails too, the item waits on the operator. A
  delegation cut off by a crash is discarded at boot.
- Evaluation capture: delegations and ask_expert as before, and the
  reader's verdicts as classifier pairs.

Tests: help tests (merge-back, discard, needs a milestone, the stuck
trigger and its once-per-milestone limit, the expert and its budget,
pinning, briefings by profile, boot discarding a cut-off delegation),
config tests for roles and profiles, and the walk delegating with a
scripted helper that sometimes fails, with a delegations_settle property.
The walk found helper commits stranded on a merged PR's branch, fixed by
returning a helper's work uncommitted.

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

nisse-dev/tests/test_loop_milestones.py

@@ -252,11 +252,11 @@ def make_world(
 
 
 def loop_agent(
-    world: dict[str, Any], model: ScriptedModel
+    world: dict[str, Any], model: ScriptedModel, **agent: Any
 ) -> tuple[LoopAgent, InMemoryTransport]:
     transport = InMemoryTransport()
     cancel = Cancel()
-    agent = LoopAgent(
+    loop = LoopAgent(
         world["store"],
         transport,
         world["forge"],
@@ -271,9 +271,10 @@ def loop_agent(
         cancel=cancel,
         oplog=OpLog("nisse-dev", io.StringIO()),
         milestones=world["milestones"],
+        **agent,
     )
-    transport.on_message(agent.on_message)
-    return agent, transport
+    transport.on_message(loop.on_message)
+    return loop, transport
 
 
 def item(world: dict[str, Any]) -> Any: