Post WP-0002/0003 hygiene: update docs and archive finished workplans

Refresh README and SCOPE to reflect stale/fuzzy/DOM capabilities. Move
EANCH-WP-0001 through EANCH-WP-0003 to workplans/archived/260709-*.

workplans/archived/260709-EANCH-WP-0002-anchor-resolution-hardening.md

@@ -0,0 +1,125 @@
+---
+id: EANCH-WP-0002
+type: workplan
+title: "Anchor resolution hardening: stale/orphan semantics, fuzzy re-anchoring, production PDF adapter"
+domain: infotech
+repo: evidence-anchor
+status: finished
+owner: codex
+topic_slug: citation_evidence_mvp
+created: "2026-07-08"
+updated: "2026-07-09"
+spec_refs:
+  - INTENT.md
+  - SCOPE.md
+  - ../citation-evidence/wiki/SharedContracts.md
+  - ../citation-evidence/wiki/ArchitectureOverview.md
+state_hub_workstream_id: "2e1ad557-11d9-4e5c-8743-973002482a0c"
+---
+
+# EANCH-WP-0002 — Anchor Resolution Hardening
+
+## Goal
+
+Close the resolution-quality gaps left open by the MVP extraction
+(`EANCH-WP-0001`) on the **existing PDF/text path**. The extracted slice
+resolves exact position/quote/PDF selectors with a fixed confidence ladder and
+returns `resolved | ambiguous | unresolved`. `INTENT.md` promises more:
+`stale` detection, orphaned-annotation handling, fuzzy/recovery re-anchoring,
+and human-confirmation workflows for ambiguity. This workplan makes those real
+without changing the shared selector *types* (those stay in `citation-engine`).
+
+Non-goals: HTML/Markdown selectors (see `EANCH-WP-0003`); new persistence or
+UI shell behavior.
+
+## Background
+
+Current extracted behavior (`src/selectors/resolve.ts`):
+
+- confidence ladder 1.00 → 0.70 across TextPosition/TextQuote/PdfPageText/PdfRect
+- multiple undisambiguated quote matches → `ambiguous` at 0.5
+- nothing matches → `unresolved` at 0.0
+- there is **no** `stale` path (the `AnnotationResolutionStatus` enum includes
+  `stale`, but resolve.ts never returns it) and **no** fuzzy matching
+
+## Task Breakdown
+
+## T01 — Stale vs. unresolved: distinguish "representation changed" from "never found"
+
+```task
+id: EANCH-WP-0002-T01
+status: done
+priority: high
+state_hub_task_id: "940b03ba-4b2f-4d1a-b7bc-72813817549d"
+```
+
+Return `stale` (not `unresolved`) when a previously-resolvable anchor no longer
+matches because the representation's canonical text changed, while the stored
+quote is still meaningful. Define the signal (e.g. position selector points
+in-range but slice ≠ quote AND quote no longer found) and preserve the original
+quote/context on the result. Add unit tests covering stale vs. unresolved.
+
+## T02 — Orphaned-annotation detection surface
+
+```task
+id: EANCH-WP-0002-T02
+status: done
+priority: medium
+depends_on: [T01]
+state_hub_task_id: "f75b94cd-bfb8-47f9-bd89-0d605f925290"
+```
+
+Give callers a way to identify annotations whose selectors can no longer be
+placed at all (orphaned) versus stale-but-recoverable. Decide whether this is a
+distinct status, a flag on `AnchorResolution`, or a helper. Keep the shared
+enum unchanged unless a contract change is agreed in the umbrella wiki first.
+
+## T03 — Fuzzy / recovery re-anchoring
+
+```task
+id: EANCH-WP-0002-T03
+status: done
+priority: high
+depends_on: [T01]
+state_hub_task_id: "8548fa44-5bb3-40cf-b8f8-e745deae7dda"
+```
+
+Add a fuzzy quote-matching fallback (bounded edit-distance / token overlap)
+below the exact ladder, returning candidates at appropriately low confidence
+with `ambiguous`/`stale` status. Must never silently emit a confident wrong
+match (INTENT: "No Silent Misleading Match"). Add tests with lightly-edited
+source text. Confirm the ladder's exact tiers are untouched above the fuzzy
+floor.
+
+## T04 — Promote the PDF spike to a production adapter
+
+```task
+id: EANCH-WP-0002-T04
+status: done
+priority: medium
+depends_on: [T03]
+state_hub_task_id: "6a7163f5-39ca-48fa-8941-8459c563198f"
+```
+
+Turn `PdfSpikeViewer` into a supported `PDFViewerAdapter` that implements the
+`DocumentViewerAdapter` contract cleanly (remove spike-only debug flags from the
+public surface, or gate them), keep viewer libs behind `src/pdf/`, and keep the
+umbrella green through the change. Update `evidence-anchor/pdf` exports and docs.
+
+## T05 — Verification + close-out
+
+```task
+id: EANCH-WP-0002-T05
+status: done
+priority: high
+depends_on: [T02, T04]
+state_hub_task_id: "1ea0885a-c541-438f-a4fd-b8be0773b373"
+```
+
+`pnpm test`/`typecheck`/`lint` green here; umbrella typecheck/test/build green
+after any contract-visible change; `fix-consistency` clean; progress note.
+
+**Verification (2026-07-09):**
+
+- `evidence-anchor`: 42 tests (9 files), typecheck + lint clean.
+- `citation-evidence`: typecheck clean, 51 integration tests passed.