diff --git a/docs/index.md b/docs/index.md
new file mode 100644
index 000000000..3b2deb73d
--- /dev/null
+++ b/docs/index.md
@@ -0,0 +1,30 @@
+# LineageWeave
+
+LineageWeave reconstructs evidence-bound lineage, project journeys, and relationship context from scattered enterprise records so people can inspect how events, claims, posts, and decisions relate over time.
+
+## Start here
+
+Use LineageWeave when source systems contain related records without reliable explicit cross-record links and you need a browsable, evidence-preserving view of branching histories rather than a flat search result.
+
+The product combines deterministic lineage assembly with bounded retrieval/fusion and optional adjudication through shared ContextualWisdomLab components. It keeps source authority, authentication, tenant scope, measurement, and model-provider routing in their owning products and contracts.
+
+## Product surfaces
+
+- lineage reconstruction and project journeys;
+- operations/dashboard views over governed records;
+- evidence-aware Global Ask and related context navigation;
+- authenticated API and web client over durable PostgreSQL state;
+- integration with ThreadWeave, RankWeave, TEPP, contextual-orchestrator, and shared context contracts through explicit boundaries.
+
+## Documentation
+
+- [Repository overview and local stack](../README.md)
+- [Architecture](../ARCHITECTURE.md)
+- [Product requirements](product-requirements.md)
+- [Product/technical gap baseline](product-technical-gap-baseline.md)
+- [Architecture decisions](adr/)
+- [Research notes](lineage-bi-research-notes.md)
+
+## Status and evidence
+
+The repository has progressed beyond its original synthetic reconstruction demo into a broader authenticated product stack, while synthetic fixtures remain important for safe examples and tests. Treat protected-main behavior, current release evidence, and repository verification as authoritative; do not infer production readiness from a documentation page or an open pull request alone.
diff --git a/frontend/src/leftoverMapPlotSmallCanvas.test.ts b/frontend/src/leftoverMapPlotSmallCanvas.test.ts
new file mode 100644
index 000000000..75d18ab13
--- /dev/null
+++ b/frontend/src/leftoverMapPlotSmallCanvas.test.ts
@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest";
+import { layoutLeftoverMapPlot, type LeftoverMapPlottablePair } from "./leftoverMapPlotLayout";
+
+const completeCaptionPair: LeftoverMapPlottablePair = {
+  pair_kind: "closest",
+  post_id: "post-small-canvas",
+  post_title: "Small canvas post",
+  criterion_code: "sales_lead_quality",
+  leftover_distance: 0.12,
+  leftover_map_reconstruction: 0.25,
+  leftover_map_explained_share: 0.76,
+  leftover_map_person_axis_1: -1,
+  leftover_map_person_axis_2: -1,
+  leftover_map_item_axis_1: 1,
+  leftover_map_item_axis_2: -1,
+};
+
+describe("layoutLeftoverMapPlot small-canvas caption bounds", () => {
+  it("keeps a complete three-caption stack inside the requested 20px height", () => {
+    const layout = layoutLeftoverMapPlot(
+      [completeCaptionPair],
+      (criterionCode) => criterionCode,
+      { height: 20 },
+    );
+
+    expect(layout).not.toBeNull();
+    expect(layout?.height).toBe(20);
+    const segment = layout?.segments[0];
+    expect(segment).toBeDefined();
+    expect(segment?.labelY).toBeGreaterThanOrEqual(12);
+    expect(segment?.reconstructionY).toBeGreaterThanOrEqual(segment?.labelY ?? 0);
+    expect(segment?.explainedShareY).toBeGreaterThanOrEqual(segment?.reconstructionY ?? 0);
+    expect(segment?.explainedShareY).toBeLessThanOrEqual(16);
+  });
+});
diff --git a/frontend/src/leftoverMapPlotVietnameseCopy.test.ts b/frontend/src/leftoverMapPlotVietnameseCopy.test.ts
new file mode 100644
index 000000000..16d29d5db
--- /dev/null
+++ b/frontend/src/leftoverMapPlotVietnameseCopy.test.ts
@@ -0,0 +1,27 @@
+import { afterEach, describe, expect, it } from "vitest";
+import { setLocale, tf } from "./i18n";
+
+const GRAPHIC_DISPLAY_COPY =
+  "Leftover map after IRT main effects. Axis ticks name persisted leftover-map coordinates. Pair segments name leftover-map distance d, leftover-map reconstruction R̂, leftover-map explained leftover share e, leftover-map unexplained leftover share s, leftover-map cross share x, leftover-map unexplained leftover U, leftover residual R, leftover observed Y, leftover expected E, and leftover-map rank. Click a post marker to open that post. The plot does not invent a leftover score.";
+
+afterEach(() => {
+  setLocale("en");
+});
+
+describe("leftover-map Vietnamese copy inheritance", () => {
+  it("keeps explained leftover share terminology as an explicit share", () => {
+    setLocale("vi");
+
+    expect(
+      tf("leftover-map explained leftover share {label}", { label: "R̂²/R² 0.76" }),
+    ).toBe("tỷ phần phần dư được giải thích trên bản đồ phần dư R̂²/R² 0.76");
+  });
+
+  it("keeps the expanded graphic description explicit about explained share e", () => {
+    setLocale("vi");
+
+    expect(tf(GRAPHIC_DISPLAY_COPY, {})).toContain(
+      "tỷ phần phần dư được giải thích e",
+    );
+  });
+});
diff --git a/lineageweave/__init__.py b/lineageweave/__init__.py
index 45c371fa7..226794a62 100644
--- a/lineageweave/__init__.py
+++ b/lineageweave/__init__.py
@@ -130,4 +130,4 @@
     "serialize_lineage_analysis_result",
 ]
 
-__version__ = "2.20.0"
+__version__ = "2.41.0"
diff --git a/tests/test_package_version.py b/tests/test_package_version.py
new file mode 100644
index 000000000..cb85f136e
--- /dev/null
+++ b/tests/test_package_version.py
@@ -0,0 +1,20 @@
+"""Release identity stays consistent across Python and frontend artifacts."""
+
+from __future__ import annotations
+
+import json
+import tomllib
+from pathlib import Path
+
+from lineageweave import __version__
+
+
+def test_release_versions_are_synchronized() -> None:
+    """Runtime provenance must use the same version as shipped package metadata."""
+    repository_root = Path(__file__).resolve().parents[1]
+    project = tomllib.loads((repository_root / "pyproject.toml").read_text(encoding="utf-8"))
+    frontend = json.loads(
+        (repository_root / "frontend" / "package.json").read_text(encoding="utf-8")
+    )
+
+    assert __version__ == project["project"]["version"] == frontend["version"]