fix(moments): the tools import the delivery module, and the tool-list cache leaves the swept directory (milestone 458 step 4a, #4922)

Two guards caught 7865313:

- test_mcp_tool_processes reads every coroutine in a tool module's
  namespace as a tool, and a name-imported attach_moment_rules looked
  like one. All seven modules now call moment_delivery.attach_moment_rules,
  and the parity guard accepts the attribute form.
- The session-ledger convention: a file in a swept directory must be a
  .ids ledger. The tool-list cache describes the install, not the
  context, so it moves to its own directory, scribe-moment, where a
  compaction does not sweep it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scribe/mcp/tools/rulebooks.py

@@ -22,7 +22,7 @@ from scribe.services import trash as trash_svc
 from scribe.services.rule_usage import (
     record_rule_outcome, record_rule_pulled,
 )
-from scribe.services.moment_delivery import attach_moment_rules
+from scribe.services import moment_delivery
 
 
 # ── Rulebook CRUD ───────────────────────────────────────────────────────
@@ -537,7 +537,7 @@ async def create_rule(
     )
     data = await rulebooks_svc.rule_detail(uid, rule, system_ids, moments)
     data.update(dedup_svc.overlap_response(overlaps, "rule"))
-    return await attach_moment_rules(uid, "create_rule", {}, data)
+    return await moment_delivery.attach_moment_rules(uid, "create_rule", {}, data)
 
 
 async def create_project_rule(
@@ -646,7 +646,7 @@ async def create_project_rule(
     )
     data = await rulebooks_svc.rule_detail(uid, rule, system_ids, moments)
     data.update(dedup_svc.overlap_response(overlaps, "rule"))
-    return await attach_moment_rules(uid, "create_project_rule", {"project_id": project_id}, data)
+    return await moment_delivery.attach_moment_rules(uid, "create_project_rule", {"project_id": project_id}, data)
 
 
 async def update_rule(
@@ -879,7 +879,7 @@ async def create_preference(
     )
     data = await rulebooks_svc.rule_detail(uid, rule, system_ids, moments)
     data.update(dedup_svc.overlap_response(overlaps, "preference"))
-    return await attach_moment_rules(uid, "create_preference", {}, data)
+    return await moment_delivery.attach_moment_rules(uid, "create_preference", {}, data)
 
 
 async def update_preference(