feat(views): wikilink + red-link model (WP-0010 T1)

A CommonMark wikilink extension: extract [[Target]] / [[Target|label]] from a
page body (skipping fenced + inline code, preserving offsets), and resolve each
target through the union — resolved is a link, unresolved is a createable
red-link (never a dropped reference). CamelCase auto-linking is off by default,
opt-in per space, and never double-counts a target already inside [[...]]. Link
model + resolution are core; rendering stays L6. New views/ package.

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

src/shard_wiki/views/__init__.py

@@ -0,0 +1,21 @@
+"""views/ — derived, recomputable, provenance-carrying read views over the union (§8.4).
+
+All views here are *derived tier*: pure functions of the attached shards plus the coordination-log
+fold, storing nothing canonical (SHARD-WP-0011 makes them incrementally maintainable). Presentation
+stays out of core (L6) — these produce models, never rendered output. Per the dependency rule this
+package imports down (union/model/coordination/provenance) and is imported only by the orchestrator.
+"""
+
+from shard_wiki.views.links import (
+    ResolvedLink,
+    WikiLink,
+    extract_links,
+    resolve_links,
+)
+
+__all__ = [
+    "WikiLink",
+    "ResolvedLink",
+    "extract_links",
+    "resolve_links",
+]