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/__init__.py

@@ -1,10 +1,16 @@
 """shard-wiki — Git-based Markdown wiki orchestrator and federation layer.
 
-See INTENT.md for the authoritative specification of scope and boundaries.
-This package orchestrates wiki-shaped content across heterogeneous *shards*;
-it is not itself a wiki engine.
+See INTENT.md for the authoritative specification of scope and boundaries, and
+spec/CoreArchitectureBlueprint.md for the architecture. This package orchestrates
+wiki-shaped content across heterogeneous *shards*; it is not itself a wiki engine.
+
+Foundation slice (SHARD-WP-0007): attach folder shard(s) to an
+:class:`~shard_wiki.space.InformationSpace`, resolve a name through the union, and
+read a page with layered provenance (chorus on ambiguity).
 """
 
+from shard_wiki.space import InformationSpace
+
 __version__ = "0.0.0"
 
-__all__ = ["__version__"]
+__all__ = ["__version__", "InformationSpace"]