feat(space): InformationSpace orchestrator + integration; foundation slice complete (WP-0007 T7)

InformationSpace ties the slice together: conformance-gated attach → resolve →
read, with alias() recording coordination decisions in the log. Exposed from the
package root. End-to-end integration test (two folder shards → union read with
layered provenance + chorus + alias redirect + red-link + nonconformant-rejected).
pyflakes clean, 39 tests green. Flips WP-0007 done.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/shard_wiki/provenance/__init__.py

@@ -13,7 +13,7 @@ only stable data types plus the pure ``effective`` composition. Mechanism never
 from __future__ import annotations
 
 import dataclasses
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from datetime import datetime
 from enum import Enum