docs(sf): clarify memory-sleeper.ts is NOT part of the memory pipeline

memory-sleeper.ts had no file header and the "memory" prefix is
misleading — it's a runtime tool-output watchdog (detects repeated
bash failures, too-large tool results) that emits steers, completely
unrelated to memory-store / memory-relations / memory-embeddings.

A contributor reading directory listing top-down would reasonably
assume this file participates in the same pipeline as the other
memory-*.ts modules. Header now states the historical naming and
points readers in the right direction.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/resources/extensions/sf/memory-sleeper.ts

@@ -1,3 +1,12 @@
+// SF Memory Sleeper — runtime tool-output watchdog
+//
+// Despite the "memory" prefix, this module is unrelated to the
+// memory-store / memory-relations / memory-embeddings pipeline. It
+// observes tool-result events at runtime and emits a steer (info /
+// warning) when patterns like a repeated bash failure or a too-large
+// tool result indicate the agent is stuck. Naming is historical —
+// "sleeper" means a dormant watcher, not a stored memory.
+
 import type { ToolResultEvent } from "@singularity-forge/pi-coding-agent";
 
 export interface MemorySleeperSteer {