EANCH-WP-0001 T06: register post-extraction gaps as follow-on workplans

Draft two proposed workplans instead of expanding this slice:
- EANCH-WP-0002 anchor-resolution-hardening (stale/orphan, fuzzy re-anchoring,
  promote PdfSpikeViewer to a production PDFViewerAdapter)
- EANCH-WP-0003 non-pdf-selectors (HTML/Markdown DomRange+Structural, non-PDF
  viewer adapter; starts with a citation-engine shared-type contract change)
Add an explicit gap map to WP-0001 T06. fix-consistency (C-06) will register
both in the hub during T07.

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

workplans/EANCH-WP-0003-non-pdf-selectors.md

@@ -0,0 +1,110 @@
+---
+id: EANCH-WP-0003
+type: workplan
+title: "Non-PDF selectors: HTML/Markdown DOM range + structural anchoring"
+domain: infotech
+repo: evidence-anchor
+status: proposed
+owner: codex
+topic_slug: citation_evidence_mvp
+created: "2026-07-08"
+updated: "2026-07-08"
+spec_refs:
+  - INTENT.md
+  - SCOPE.md
+  - ../citation-evidence/wiki/SharedContracts.md
+  - ../citation-evidence/docs/decisions/ADR-0006-selector-ownership-split.md
+---
+
+# EANCH-WP-0003 — Non-PDF Selectors (HTML / Markdown)
+
+## Goal
+
+Extend anchoring beyond PDFs to non-paginated documents (HTML, Markdown),
+delivering the `DomRangeSelector` and `StructuralSelector` concepts that
+`INTENT.md` names but the MVP left as `never`. The extracted package already
+models format-neutral resolution (`DocumentViewerAdapter`, canonical-text
+selectors); this workplan fills in the DOM branch of `SelectionCapture` and a
+concrete HTML/Markdown viewer adapter.
+
+Depends on the extraction (`EANCH-WP-0001`) being complete. Independent of the
+resolution-hardening track (`EANCH-WP-0002`) except where both touch the shared
+enum — coordinate contract changes in the umbrella wiki first.
+
+## Background
+
+- `src/types.ts`: `DomSelectionCapture = never` (reserved) — the capture union
+  only has a PDF branch today.
+- `citation-engine` shared selector types already declare `DomRangeSelector`
+  and `StructuralSelector` as `never` placeholders; promoting them is a
+  shared-contract change and must land in `citation-engine` first (ADR-0006:
+  selector *types* live in engine).
+
+## Task Breakdown
+
+## T01 — Contract: promote DomRange/Structural selector types in citation-engine
+
+```task
+id: EANCH-WP-0003-T01
+status: todo
+priority: high
+```
+
+Define the real `DomRangeSelector` and `StructuralSelector` shapes (DOM path +
+range offsets; heading/section/block/AST path) in `citation-engine`'s shared
+selector module, plus the `DomSelectionCapture` payload contract in the wiki.
+Land this in the engine + `SharedContracts.md` before writing anchor behavior.
+
+## T02 — Selector creation from a DOM/Markdown selection
+
+```task
+id: EANCH-WP-0003-T02
+status: todo
+priority: high
+depends_on: [T01]
+```
+
+Implement `createSelectors` for the DOM branch: build TextQuote + TextPosition
+(against canonical text) plus DomRange + Structural selectors from a captured
+DOM selection. Add unit tests mirroring the PDF create tests.
+
+## T03 — Resolution for non-paginated documents
+
+```task
+id: EANCH-WP-0003-T03
+status: todo
+priority: high
+depends_on: [T02]
+```
+
+Extend `resolveSelectors` to resolve DomRange/Structural selectors and rank
+them in the confidence ladder alongside the existing text selectors, keeping
+paginated (PDF) and non-paginated resolution on shared concepts. Tests for
+re-render stability (structural fallback when offsets shift).
+
+## T04 — HTML/Markdown viewer adapter
+
+```task
+id: EANCH-WP-0003-T04
+status: todo
+priority: medium
+depends_on: [T03]
+```
+
+Add a `DocumentViewerAdapter` implementation for rendered HTML/Markdown
+(selection capture, scroll-to-target, highlight render), behind a subpath
+export analogous to `evidence-anchor/pdf`, with viewer-specific deps confined
+to that boundary.
+
+## T05 — Verification + close-out
+
+```task
+id: EANCH-WP-0003-T05
+status: todo
+priority: high
+depends_on: [T04]
+```
+
+Package green (`pnpm test`/`typecheck`/`lint`); engine contract change verified
+in `citation-engine`; any umbrella consumer green; `fix-consistency` clean;
+progress note.