workplans: register follow-up implementation roadmap (WP-0009..0012)

WP-0009 git-backed DecisionLog + per-space append authority (keystone backing);
WP-0010 derived views (wikilinks, BackLinks, RecentChanges, AllPages/SiteMap);
WP-0011 incremental union + equivalence index + I-2 verification;
WP-0012 second adapter (git-IS-store) validating the contract on a new substrate.

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

workplans/SHARD-WP-0010-derived-views.md

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+---
+id: SHARD-WP-0010
+type: workplan
+title: "derived views — wikilinks, BackLinks, RecentChanges, AllPages/SiteMap"
+domain: whynot
+repo: shard-wiki
+status: active
+owner: tegwick
+topic_slug: whynot
+created: "2026-06-15"
+updated: "2026-06-15"
+depends_on:
+  - SHARD-WP-0007
+---
+
+# SHARD-WP-0010 — Derived views
+
+## Goal
+
+Implement the **core derived views** over the union (`FederationRequirements` ADR-03): the
+wikilink/red-link model (ADR-06), **BackLinks** (the strongest core view), **RecentChanges**,
+and **AllPages / SiteMap**. All are derived-tier (recomputable; incrementally maintainable
+later by SHARD-WP-0011) and carry provenance. Presentation stays out of core (L6).
+
+**Non-goal:** full-text Search (hybrid delegate-or-derive — a later workplan); ranking; a UI.
+
+## Context
+
+- Views decision: `FederationRequirements.md` ADR-03; links: ADR-06. Blueprint §8.4.
+- Builds on the union (`src/shard_wiki/union/`) + coordination journal.
+
+---
+
+## Wikilink + red-link model
+
+```task
+id: SHARD-WP-0010-T1
+status: todo
+priority: high
+```
+
+A CommonMark **wikilink extension** parser (`[[Target]]` / `[[Target|label]]`) that extracts
+link targets from a page body and resolves each via the union (ADR-01): resolved → link;
+unresolved → **red-link** (createable, UC-23). CamelCase auto-link off by default (opt-in per
+space). The link **model + resolution is core**; rendering is L6. Tests: extraction, resolve vs
+red-link, CamelCase opt-in.
+
+## BackLinks (core)
+
+```task
+id: SHARD-WP-0010-T2
+status: todo
+priority: high
+```
+
+A derived **BackLinks** index over the union link graph: for any identity, the set of pages
+linking to it (UC-18). Built from T1 link extraction across attached shards; entries carry
+source provenance. Tests: A→B link yields B.backlinks ⊇ {A}; red-links don't create backlinks;
+chorus pages aggregate.
+
+## RecentChanges (core)
+
+```task
+id: SHARD-WP-0010-T3
+status: todo
+priority: medium
+```
+
+A **RecentChanges** view merging the coordination journal (overlay/apply/alias/fork events)
+with shard change signals (mtime/`current_rev`; `notify` later), ordered, across the union
+(UC-17). Each entry carries provenance (which shard / which decision). Tests: an edit and an
+alias both appear, newest-first; per-shard attribution present.
+
+## AllPages / SiteMap (core)
+
+```task
+id: SHARD-WP-0010-T4
+status: todo
+priority: low
+```
+
+**AllPages** (enumerate union identities, de-duplicated by equivalence/chorus) and a simple
+**SiteMap** (namespace tree from placements). Tests: union enumeration spans shards; chorus
+collapses to one entry with divergence noted; sitemap reflects paths.
+
+## Wiring + integration
+
+```task
+id: SHARD-WP-0010-T5
+status: todo
+priority: medium
+```
+
+Expose `InformationSpace.backlinks(name)`, `recent_changes()`, `all_pages()`, `site_map()`.
+Integration test over two shards. Update SCOPE; `pytest` + pyflakes green.
+
+---
+
+## Acceptance criteria
+
+- Wikilink resolution + red-link detection work via the union (ADR-01/ADR-06).
+- BackLinks, RecentChanges, AllPages, SiteMap computed over the union, provenance-carrying,
+  presentation-free (core only).
+- Views are derived/recomputable; no canonical state introduced.
+- `pytest` + pyflakes green; each task committed; state-hub synced.
+
+## Suggested task order
+
+T1 wikilinks → T2 BackLinks → T3 RecentChanges → T4 AllPages/SiteMap → T5 wiring.