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>

tests/test_integration.py

@@ -0,0 +1,80 @@
+"""End-to-end slice test (SHARD-WP-0007 T7): attach folder shards → resolve → read union."""
+
+import shard_wiki
+from shard_wiki import InformationSpace
+from shard_wiki.adapters import ConformanceError, FolderAdapter, ShardAdapter
+from shard_wiki.model import CapabilityProfile, Identity, Page
+from shard_wiki.provenance import ProvenanceEnvelope, Staleness
+from shard_wiki.union import ResolutionKind
+
+
+def _folder(tmp_path, name, files):
+    root = tmp_path / name
+    for rel, text in files.items():
+        p = root / rel
+        p.parent.mkdir(parents=True, exist_ok=True)
+        p.write_text(text, encoding="utf-8")
+    return FolderAdapter(name, root)
+
+
+def test_public_api_surface():
+    assert isinstance(shard_wiki.__version__, str) and shard_wiki.__version__
+    assert shard_wiki.InformationSpace is InformationSpace
+
+
+def test_attach_resolve_read_union_with_provenance_and_chorus(tmp_path):
+    space = InformationSpace("team")
+    space.attach(_folder(tmp_path, "wikiA", {"Home.md": "A home", "OnlyA.md": "a"}))
+    space.attach(_folder(tmp_path, "wikiB", {"Home.md": "B home", "OnlyB.md": "b"}))
+
+    # unique page → single, with provenance attributing the source shard
+    only_a = space.read("OnlyA")
+    assert only_a.body == "a"
+    assert only_a.envelope.source_shard == "wikiA"
+    assert only_a.envelope.staleness is Staleness.FRESH
+    assert only_a.envelope.observed_at is not None
+
+    # same name in both shards → chorus, divergence recorded both ways (union without erasure)
+    res = space.resolve("Home")
+    assert res.kind is ResolutionKind.CHORUS
+    assert {p.envelope.source_shard for p in res.pages} == {"wikiA", "wikiB"}
+    for p in res.pages:
+        assert len(p.envelope.divergence) == 1
+
+    # missing → red-link
+    assert space.resolve("Ghost").is_red_link
+
+
+def test_alias_redirects_across_the_union(tmp_path):
+    space = InformationSpace("team")
+    space.attach(_folder(tmp_path, "wikiA", {"Index.md": "the index"}))
+    space.alias("Start", "wikiA:Index")
+    assert space.read("Start").body == "the index"
+
+
+class _LyingShard(ShardAdapter):
+    def __init__(self, profile: CapabilityProfile) -> None:
+        self._p = profile
+
+    @property
+    def shard_id(self) -> str:
+        return "liar"
+
+    def profile(self) -> CapabilityProfile:
+        return self._p
+
+    def keys(self):
+        return ["X"]
+
+    def read(self, key: str) -> Page:
+        return Page(Identity("not-liar", key), "x", ProvenanceEnvelope(source_shard="x"))
+
+
+def test_attach_rejects_nonconformant_shard(tmp_path):
+    good_profile = _folder(tmp_path, "wikiA", {"Home.md": "x"}).profile()
+    space = InformationSpace("team")
+    try:
+        space.attach(_LyingShard(good_profile))
+        raise AssertionError("expected ConformanceError")
+    except ConformanceError:
+        pass