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>

eslint.config.js

@@ -0,0 +1,54 @@
+// ESLint flat config — enforces the DependencyMap §2 edge set for
+// `evidence-binder`: it may depend on `citation-engine` and `evidence-anchor`,
+// and must NOT depend on `evidence-source`, `citation-work`, or the umbrella
+// `citation-evidence`.
+
+import js from "@eslint/js";
+import tseslint from "typescript-eslint";
+import importPlugin from "eslint-plugin-import";
+import globals from "globals";
+
+// Package specifiers and relative-path prefixes that would cross a forbidden
+// dependency edge. Anchor and engine are the only allowed sibling edges.
+const FORBIDDEN_EDGES = [
+  { name: "@citation-evidence/evidence-source", message: "binder must not depend on evidence-source (DependencyMap §2)." },
+  { name: "@citation-evidence/work", message: "binder must not depend on citation-work (DependencyMap §2)." },
+  { name: "@citation-evidence/citation-work", message: "binder must not depend on citation-work (DependencyMap §2)." },
+];
+
+const FORBIDDEN_PATTERNS = [
+  { group: ["../evidence-source/*", "../citation-work/*", "../citation-evidence/*"], message: "binder must not reach into evidence-source, citation-work, or the umbrella (DependencyMap §2)." },
+];
+
+export default tseslint.config(
+  {
+    ignores: ["dist/", "node_modules/", "coverage/", "**/*.d.ts"],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    files: ["src/**/*.{ts,tsx}"],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: "module",
+      globals: { ...globals.node, ...globals.browser },
+    },
+    plugins: {
+      import: importPlugin,
+    },
+    settings: {
+      "import/resolver": {
+        typescript: { project: "./tsconfig.json" },
+      },
+    },
+    rules: {
+      "no-restricted-imports": [
+        "error",
+        {
+          paths: FORBIDDEN_EDGES,
+          patterns: FORBIDDEN_PATTERNS,
+        },
+      ],
+    },
+  },
+);