Extract binder package from citation-evidence (EBIND-WP-0001)

Extracts citation-evidence/src/binder/ into this repo as the standalone
@citation-evidence/evidence-binder package: headless binding service +
in-memory link repo, active-state machine, the SharedContracts §7
rect-registry contract (registry, change pumps, hooks, SVG overlay), and
the target-neutral reference FormRenderer.

- toolchain mirrors sibling extracted repos (pnpm/tsc/vitest/eslint);
  imports rewritten from @shared/@engine aliases to the engine's
  @citation-evidence/engine package specifiers
- dependency boundary (engine + anchor only; no source/work/umbrella)
  enforced via eslint no-restricted-imports
- docs: extraction inventory + contract deltas, ADR-0001 (reference UI
  kept as supported exports), refreshed README/SCOPE/INTENT, populated
  capabilities index
- typecheck + lint green, 37 tests passing

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

docs/extraction-inventory.md

@@ -0,0 +1,73 @@
+# Extraction inventory & contract deltas (EBIND-WP-0001-T01)
+
+Locks the extraction boundary for pulling `citation-evidence/src/binder/` into
+this repository. Authority for the shared contracts remains the umbrella wiki
+(`../citation-evidence/wiki/SharedContracts.md`,
+`../citation-evidence/wiki/DependencyMap.md`) until the cutover is complete.
+
+## 1. Files that extract into this repo
+
+All of `citation-evidence/src/binder/` moves to `evidence-binder/src/`:
+
+| Concern | Files |
+| --- | --- |
+| Headless link repo | `repos/in-memory-links.ts`, `repos/index.ts` |
+| Binding service | `services/bindings.ts` (+ `.test.ts`), `services/index.ts` |
+| Active-state machine | `state/active.ts` (+ `.test.ts`), `state/index.ts` |
+| Provider composition | `BinderProvider.tsx` |
+| Visual guide (rect registry) | `visual-guide/rect-registry.ts` (+ `.test.ts`), `visual-guide/events.ts`, `visual-guide/react-hooks.ts` (+ `.dom.test.tsx`), `visual-guide/Overlay.tsx` (+ `.dom.test.tsx`), `visual-guide/index.ts` |
+| Reference UI | `FormRenderer.tsx` (+ `FormRenderer.dom.test.tsx`), `FieldDefinitionForm.tsx` |
+| Barrel | `index.ts` |
+
+The upstream `src/binder/README.md` is **not** carried over — this repo's
+top-level `README.md` supersedes it.
+
+## 2. Files that remain umbrella-only
+
+Everything that composes binder with the rest of the app stays in the umbrella
+(`citation-evidence/src/app/**`): `FormsApp.tsx`, `HighlightRectBridge.tsx`,
+`ActiveEvidenceChips.tsx`, `CaptureLinkPersister.tsx`, `capture-persistence.ts`,
+`App.tsx`. These are consumers of the binder, not part of it.
+
+## 3. Import-alias rewrite
+
+Upstream binder files used the umbrella's internal path aliases. On extraction
+they are rewritten to the engine's published package specifiers (the same
+convention `evidence-anchor` uses):
+
+| Upstream alias | Extracted specifier |
+| --- | --- |
+| `@shared/evidence-link`, `@shared/ids` | `@citation-evidence/engine/shared` |
+| `@engine/events` | `@citation-evidence/engine` |
+
+No source imported `@binder/*`, `@work/*`, `@source/*`, or `@app/*`, so no
+forbidden edge existed in the slice. The binder MVP slice imports **only** from
+`citation-engine` (shared types + event bus). It does not currently import
+`evidence-anchor`, which is an *allowed but unused* edge (DependencyMap §2).
+
+## 4. Contract deltas resolved
+
+- **`EvidenceTarget` naming / target vocabulary.** No drift. The engine's
+  `EvidenceTarget` (`{ targetType, targetId }`) and the closed
+  `EvidenceTargetType` catalogue (`form-field`, `claim`, `requirement`,
+  `decision`, `document-section`) are canonical and consumed as-is. The MVP only
+  exercises `form-field`. `INTENT.md` previously listed extra target kinds
+  ("tasks, or other information objects"); that is aspirational prose, not a
+  competing enum, and is left as narrative.
+- **Dropped relation values `derived-from` / `needs-check`.** These are **not**
+  members of the canonical `EvidenceRelation` enum (`supports`, `contradicts`,
+  `explains`, `qualifies`, `source-for`, `context-for`). The extracted package
+  does **not** reintroduce them; any earlier INTENT mention of them is dropped
+  from the implemented surface.
+- **Event vocabulary / removal semantics.** The binding service emits only
+  canonical bus events: `EvidenceLinkCreated`, `EvidenceLinkUpdated`,
+  `EvidenceLinkRemoved` (hard-delete; rejected-status path deferred), and
+  `EvidenceItemActivated` / `FormFieldActivated`. All are members of the engine's
+  `EngineEvent` union — no local event vocabulary is introduced.
+
+## 5. Forbidden dependency edges (called out before copy)
+
+Per DependencyMap §2, `evidence-binder` may depend on `citation-engine` and
+`evidence-anchor`, and must **not** depend on `evidence-source`,
+`citation-work`, or the umbrella `citation-evidence`. This boundary is enforced
+mechanically by `eslint.config.js` (`no-restricted-imports`).