M5.2: agent memory

remember(name, description, fact) and forget(name, why): control tools for
the driver (before the go-ahead too) and conversations, writing only the
agent's own vault folder, one note per fact with its provenance. No one
agrees first; each change is a line in the thread. The harness keeps the
index and puts it into the transcript once per item, with a hash.

At an item's close, completed or abandoned, a bounded memory pass (the
driver's model, its own transcript and view) records what was decided and
learned; it never holds the close up (tuning.memory.max_turns).

With the operator: corrections may be paraphrased (L6 changed), the model
forgets on its own, and nothing limits what may prompt a note. The walk
remembers and forgets, and checks nothing lands outside the agent's folder.

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/tools.py

@@ -108,6 +108,29 @@ SEARCH_NOTES = _tool(
 )
 NOTE_TOOLS = [READ_NOTE, LIST_NOTES, SEARCH_NOTES]
 
+# Agent memory (L6.4): the agent's own notes, one fact each, no asking.
+REMEMBER = _tool(
+    "remember",
+    "Remember one fact for later work: the operator's preferences, a lesson, "
+    "a decision and its reason. One note per fact; the same name replaces it.",
+    name="A short name: lowercase letters, digits and -, like prefers-small-prs.",
+    description="One line saying what the note is, for your memory's index.",
+    fact="The fact and why it matters; for something the operator said, who "
+    "said it and its gist.",
+)
+FORGET = _tool(
+    "forget",
+    "Forget a note of yours that is wrong or superseded.",
+    name="The note's name.",
+    why="Why it's no longer true or needed.",
+)
+MEMORY_TOOLS = [REMEMBER, FORGET]
+MEMORY_DONE = _tool(
+    "memory_done",
+    "You've recorded what will matter later: end the pass.",
+    summary="What you remembered or forgot, in a line.",
+)
+
 # A conversation's tools (L1, L5): it talks, and may propose work.
 REPLY = _tool(
     "reply",
@@ -153,6 +176,7 @@ WAITING = frozenset(
         "propose_project",
         "toolchain_ready",
         "request_reimage",
+        "memory_done",
     }
 )