M7.2: share the loop's parts

Shared parts, not a shared scheduler (agreed): nisse-review will have its
own small scheduler; a common one waits until two exist to compare.

- nisse_core.loop.driver: the driver run, moved; the agent names its
  waiting tools per run (nisse-dev's are WAITING_TOOLS), and execution
  goes to any Executor (ToolOutcome moves with it).
- nisse_core.loop.tools: the tool helper and the tools any agent offers
  (notes, memory, memory_done, ask_expert); nisse_core.loop.expert.
- nisse_core.knowledge.handlers: Knowledge, the vault and memory as
  control tools, the index and prompt text, out of LoopAgent.
- nisse_core.config: file reading, references, people, tuning sections of
  the agent's own, LLM numbers, the vault.
- New core tests: a driver run with a non-workspace executor and the
  agent's own waiting set; Knowledge alone; the shared config pieces.

Docs: the Development Plan marks M7.2 done; Architecture Part L and the
nisse-core README name the new parts.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk

nisse-dev/src/nisse_dev/loop/help.py

@@ -11,13 +11,13 @@ half-edited tree).
 from collections.abc import Callable, Mapping
 from dataclasses import dataclass, field
 
+from nisse_core.loop.expert import DEFAULT_BUDGET
+from nisse_core.loop.tools import tool
 from nisse_core.models.llm import LLMClient, RoleMap
 from nisse_dev.config import Profile
 from nisse_dev.delegation import Caps
-from nisse_dev.expert import DEFAULT_BUDGET
-from nisse_dev.loop.tools import _tool
 
-DELEGATE = _tool(
+DELEGATE = tool(
     "delegate",
     "Hand a sub-task of the current milestone to a helper, who works on the "
     "milestone's branch with the same tools and reports back what changed, "
@@ -26,13 +26,6 @@ DELEGATE = _tool(
     "milestone started.",
     task="The sub-task, self-contained: what to do, where, and how to know it's done.",
 )
-ASK_EXPERT = _tool(
-    "ask_expert",
-    "Ask an expert one self-contained question: a design trade-off, how a "
-    "library behaves. It can't see the repository. The budget per item is "
-    "small.",
-    question="The question, with whatever context it needs.",
-)
 
 
 @dataclass(frozen=True)