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/build.py

@@ -24,6 +24,7 @@ from nisse_dev.loop.help import Helpers
 from nisse_dev.loop.milestones import Milestones
 from nisse_dev.loop.reader import GoAheadReader
 from nisse_dev.matrix import MatrixTransport
+from nisse_dev.memory import Memory
 from nisse_dev.oplog import OpLog
 from nisse_dev.state import StateStore
 from nisse_dev.tools import Workspace
@@ -36,6 +37,7 @@ from nisse_dev.worker import SerialWorker
 SHUTDOWN_WAIT_S = 10.0
 
 TOOL_DRIVING_ROLES = ("driver", "helper")
+MEMORY_FOLDER = "memory/nisse-dev"  # L10: the agent's own, in its vault
 
 
 def discover_models(config: AgentConfig, oplog: OpLog) -> ModelCatalog:
@@ -298,6 +300,11 @@ def build_loop_agent(
         profiles=config.profiles,
     )
     transport = MatrixTransport(config.matrix)
+    vault = (
+        Vault(config.vault.root, config.vault.folders, ignore=config.vault.ignore)
+        if config.vault
+        else None
+    )
     loop = LoopAgent(
         store,
         transport,
@@ -334,12 +341,15 @@ def build_loop_agent(
         general_idle_s=config.tuning.loop.general_idle_s,
         vm_retry_s=config.tuning.build_vm.retry_s,
         vm_settle_s=config.tuning.build_vm.settle_s,
-        # L10: the knowledge vault, when configured.
-        vault=(
-            Vault(config.vault.root, config.vault.folders, ignore=config.vault.ignore)
-            if config.vault
+        # L10: the knowledge vault, when configured; L6.4: the agent's
+        # memory, when its own folder in it is read-write.
+        vault=vault,
+        memory=(
+            Memory(vault, MEMORY_FOLDER)
+            if vault and vault.folders().get(MEMORY_FOLDER) == "rw"
             else None
         ),
+        memory_turns=config.tuning.memory.max_turns,
     )
     return RunningLoop(
         config=config,