feat(memory): implement memory scoping with hierarchy and access control (#93)

Add scope management system for hierarchical memory access:
- ScopeManager with hierarchy: Global → Project → Agent Type → Agent Instance → Session
- ScopePolicy for access control (read, write, inherit permissions)
- ScopeResolver for resolving queries across scope hierarchies with inheritance
- ScopeFilter for filtering scopes by type, project, or agent
- Access control enforcement with parent scope visibility
- Deduplication support during resolution across scopes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/services/memory/scoping/__init__.py

@@ -1,3 +1,4 @@
+# app/services/memory/scoping/__init__.py
 """
 Memory Scoping
 
@@ -5,4 +6,28 @@ Hierarchical scoping for memory with inheritance:
 Global -> Project -> Agent Type -> Agent Instance -> Session
 """
 
-# Will be populated in #93
+from .resolver import (
+    ResolutionOptions,
+    ResolutionResult,
+    ScopeFilter,
+    ScopeResolver,
+    get_scope_resolver,
+)
+from .scope import (
+    ScopeInfo,
+    ScopeManager,
+    ScopePolicy,
+    get_scope_manager,
+)
+
+__all__ = [
+    "ResolutionOptions",
+    "ResolutionResult",
+    "ScopeFilter",
+    "ScopeInfo",
+    "ScopeManager",
+    "ScopePolicy",
+    "ScopeResolver",
+    "get_scope_manager",
+    "get_scope_resolver",
+]