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-core/tests/test_context.py

@@ -14,6 +14,7 @@ from nisse_core.log.canonical import (
     ToolResult,
     UserMessage,
 )
+from nisse_core.loop.driver import Driver
 from nisse_core.models.catalog import ModelCatalog, UnknownLimits
 from nisse_core.models.context import (
     Budget,
@@ -25,7 +26,6 @@ from nisse_core.models.context import (
 )
 from nisse_core.oplog import OpLog
 from nisse_core.state.store import StateStore
-from nisse_dev.loop.driver import Driver
 
 
 def stored(events: list[CanonicalEvent]) -> list[StoredEvent]:
@@ -244,6 +244,7 @@ def test_a_request_that_cannot_fit_ends_the_run(tmp_path: Path) -> None:
         store.transcript("t", "driver"),
         system="s" * 20_000,  # a system prompt too big to fit
         tools=[],
+        waiting=(),
         workspace=None,
     )