feat: extract review-workspace slice into @citation-evidence/work (CWORK-WP-0001)

Establishes citation-work as the standalone home of the review workspace,
migrated out of the citation-evidence umbrella app.

- Package/tooling scaffold: package.json, tsconfig, vite/vitest/eslint configs
  with eslint-plugin-boundaries enforcing engine/anchor/source-only imports
- Providers/hooks: EngineProvider, SessionProvider + use* hooks (T02)
- Panes: CollectionList, ViewerShell, EvidenceSidebar (T03/T04/T05)
- Capture/edit: InlineCaptureForm, EvidenceFormBody; UploadDropzone owned here
- ReviewShell: repo-owned three-pane layout with an upload slot seam
- Tests: CollectionList, InlineCaptureForm capture flow, EvidenceSidebar
  export/edit/activation (11 tests, all green)
- Anchor consumed as @citation-evidence/evidence-anchor package; @source kept
  on the umbrella facade for its local viewer-url policy
- Docs (README/SCOPE) refreshed; deferred gaps recorded

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

src/work/EvidenceFormBody.tsx

@@ -0,0 +1,104 @@
+/**
+ * EvidenceFormBody — the shared "citation + commentary" editor.
+ *
+ * One form drives both:
+ *   - the *capture* flow (creating evidence from a fresh selection
+ *     inside `InlineCaptureForm`), and
+ *   - the *edit* flow (modifying an existing evidence card inside
+ *     `EvidenceSidebar`).
+ *
+ * Keeping a single component means changes to the field layout, hint
+ * placement, or save-button copy land in one file and apply to both
+ * surfaces. Callers control the labels and any badge/helper text.
+ */
+
+import type { CSSProperties, ReactNode } from "react";
+
+export interface EvidenceFormBodyProps {
+  readonly quote: string;
+  readonly commentary: string;
+  onChangeQuote(next: string): void;
+  onChangeCommentary(next: string): void;
+  onSave(): void;
+  onCancel(): void;
+  /** Save-button label, defaults to "Save". */
+  readonly saveLabel?: string;
+  /** Cancel-button label, defaults to "Cancel". */
+  readonly cancelLabel?: string;
+  /** Short caption rendered at the top of the form, e.g. a selector
+   *  count badge or "Editing". */
+  readonly badge?: ReactNode;
+  /** Inline note shown under the buttons (e.g. "won't move the
+   *  marked passage" when editing an existing item). */
+  readonly helper?: ReactNode;
+  /** data-testid prefix for the input + button hooks. */
+  readonly testidPrefix: string;
+}
+
+export function EvidenceFormBody(p: EvidenceFormBodyProps) {
+  const saveLabel = p.saveLabel ?? "Save";
+  const cancelLabel = p.cancelLabel ?? "Cancel";
+  return (
+    <div style={{ padding: 8, fontSize: 12 }}>
+      {p.badge && (
+        <div style={{ marginBottom: 6, fontWeight: 600 }}>{p.badge}</div>
+      )}
+      <label style={labelStyle}>Citation text</label>
+      <textarea
+        value={p.quote}
+        onChange={(e) => p.onChangeQuote(e.target.value)}
+        data-testid={`${p.testidPrefix}-quote`}
+        rows={3}
+        style={{
+          ...textareaStyle,
+          fontStyle: "italic",
+        }}
+      />
+      <label style={labelStyle}>Commentary</label>
+      <textarea
+        value={p.commentary}
+        onChange={(e) => p.onChangeCommentary(e.target.value)}
+        data-testid={`${p.testidPrefix}-commentary`}
+        rows={2}
+        placeholder="(optional)"
+        style={textareaStyle}
+      />
+      <div style={{ display: "flex", gap: 6, alignItems: "center" }}>
+        <button
+          type="button"
+          onClick={p.onSave}
+          data-testid={`${p.testidPrefix}-save`}
+          style={{ fontSize: 12, padding: "4px 10px" }}
+        >
+          {saveLabel}
+        </button>
+        <button
+          type="button"
+          onClick={p.onCancel}
+          data-testid={`${p.testidPrefix}-cancel`}
+          style={{ fontSize: 12, padding: "4px 10px" }}
+        >
+          {cancelLabel}
+        </button>
+        {p.helper && (
+          <span style={{ fontSize: 11, color: "#888" }}>{p.helper}</span>
+        )}
+      </div>
+    </div>
+  );
+}
+
+const labelStyle: CSSProperties = {
+  display: "block",
+  color: "#666",
+  fontSize: 11,
+  marginBottom: 2,
+};
+
+const textareaStyle: CSSProperties = {
+  width: "100%",
+  boxSizing: "border-box",
+  fontSize: 12,
+  padding: 4,
+  marginBottom: 6,
+};