diff --git a/CHANGELOG.d/1.0.0-analysis-run-opened-report-next-action.md b/CHANGELOG.d/1.0.0-analysis-run-opened-report-next-action.md
new file mode 100644
index 000000000..a42a6b538
--- /dev/null
+++ b/CHANGELOG.d/1.0.0-analysis-run-opened-report-next-action.md
@@ -0,0 +1,5 @@
+# 1.0.0 Name the next action on the landed Demo Corp report
+
+Open period report 2026-W02 names the opened grouping and puts the
+visible Corporate entity caption plus mean θ in the focused chip.
+Mean θ stays on the report panel.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 328aec876..bd9a3aa06 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,17 @@ All notable changes to this project are documented here. Format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); versioning follows
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.0] - 2026-08-17
+
+### Added
+
+- Opening **Open period report 2026-W02** now names the next action on
+  the landed Demo Corp report: read its mean θ and member posts, then
+  open a post. The focused comparison chip uses the visible
+  `Corporate entity: Demo Corp` caption and the persisted mean θ
+  (WCAG 2.5.3). Changing the week still focuses the report period
+  field. Mean θ stays on the report panel. No TEPP theta is invented.
+
 ## [0.99.0] - 2026-08-17
 
 ### Added
diff --git a/CLAUDE.md b/CLAUDE.md
index 239d659f2..4f9b0b182 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -43,6 +43,9 @@ the parent-choice digest.
 After `make seed`, open **Period report · Succeeded · Demo Corp**,
 then **Open period report 2026-W02**. The home week is already
 2026-W02, so the grouping comparison strip lands on Demo Corp. Report
-grouping is Corporate entity and Demo Corp is current. Changing the
-week first still focuses the report period field. Mean θ stays on the
-period-report panel.
+grouping is Corporate entity and Demo Corp is current. The focused
+chip name contains `Corporate entity: Demo Corp` and the persisted
+mean θ. The period-report panel says Demo Corp is the opened grouping
+and to read its mean θ and member posts, then open a post. Changing
+the week first still focuses the report period field. Mean θ stays on
+the period-report panel.
diff --git a/docs/adr/0024-seed-period-report-analysis-run.md b/docs/adr/0024-seed-period-report-analysis-run.md
index eac3ad477..9e824e7e0 100644
--- a/docs/adr/0024-seed-period-report-analysis-run.md
+++ b/docs/adr/0024-seed-period-report-analysis-run.md
@@ -50,7 +50,10 @@ rows. Opening it shows the cutoff posts and **Open period report
 2026-W02** (the week stored on `scope_key`). That click also switches
 Report grouping to Corporate entity and marks the Demo Corp grouping
 current, using the persisted scope grouping key. When the operator is
-already on that week, the comparison strip lands on Demo Corp. Mean θ
+already on that week, the comparison strip lands on Demo Corp. The
+focused chip name contains the visible Corporate entity caption and
+the persisted mean θ. The period-report panel names the next action:
+read that grouping's mean θ and member posts, then open a post. Mean θ
 remains on the period-report panel. Re-seed is idempotent on
 `demo-report-seed-2026-w02`.
 
diff --git a/frontend/package.json b/frontend/package.json
index 7095b7fc7..30a383f95 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "0.99.0",
+  "version": "1.0.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/frontend/src/App.test.tsx b/frontend/src/App.test.tsx
index ee9d00ea5..e0335f531 100644
--- a/frontend/src/App.test.tsx
+++ b/frontend/src/App.test.tsx
@@ -746,7 +746,7 @@ describe("App, authenticated", () => {
                 grouping_kind: "corporate_entity",
                 grouping_key: "corp-1",
                 grouping_label: "Demo Corp",
-                mean_theta: 0.01,
+                mean_theta: 0.42,
                 post_count: 8,
                 link_method: "fipc",
               },
@@ -2181,11 +2181,14 @@ describe("App, authenticated", () => {
     expect(groupingSelect).toHaveValue("corporate_entity");
     expect(periodInput).toHaveFocus();
     expect(
-      screen.getByRole("button", { name: "Compare corporate_entity: Demo Corp" }),
+      screen.getByRole("button", { name: "Compare Corporate entity: Demo Corp, mean θ 0.42" }),
     ).toHaveAttribute("aria-current", "true");
     expect(
-      screen.getByRole("button", { name: "Compare process_unit: Demo Report High" }),
+      screen.getByRole("button", { name: "Compare Process unit: Demo Report High, mean θ 0.81" }),
     ).not.toHaveAttribute("aria-current");
+    expect(screen.getByRole("status")).toHaveTextContent(
+      "Demo Corp is the opened grouping. Read its mean θ and member posts below, then open a post.",
+    );
     expect(await screen.findByText(/Demo Corp: mean θ 0\.42/)).toBeInTheDocument();
     expect(screen.queryByText(/corp-1: mean θ/)).not.toBeInTheDocument();
   });
@@ -2211,11 +2214,18 @@ describe("App, authenticated", () => {
 
       expect(periodInput).toHaveValue("2026-W02");
       expect(screen.getByLabelText("Report grouping")).toHaveValue("corporate_entity");
-      const demoChip = screen.getByRole("button", { name: "Compare corporate_entity: Demo Corp" });
+      const demoChip = screen.getByRole("button", {
+        name: "Compare Corporate entity: Demo Corp, mean θ 0.42",
+      });
       expect(demoChip).toHaveAttribute("aria-current", "true");
       expect(demoChip).toHaveFocus();
+      expect(demoChip).toHaveAccessibleName(/Corporate entity: Demo Corp/);
+      expect(demoChip).toHaveAccessibleName(/mean θ 0\.42/);
       expect(scrollIntoView).toHaveBeenCalled();
       expect(periodInput).not.toHaveFocus();
+      expect(screen.getByRole("status")).toHaveTextContent(
+        "Demo Corp is the opened grouping. Read its mean θ and member posts below, then open a post.",
+      );
       expect(await screen.findByText(/Demo Corp: mean θ 0\.42/)).toBeInTheDocument();
     } finally {
       HTMLElement.prototype.scrollIntoView = originalScrollIntoView;
@@ -2408,7 +2418,7 @@ describe("App, authenticated", () => {
     stubBackend();
     render(<App />);
 
-    expect(await screen.findByText(/mean θ 0.42/)).toBeInTheDocument();
+    expect((await screen.findAllByText(/mean θ 0.42/)).length).toBeGreaterThan(0);
     expect(screen.getAllByText(/8 posts/).length).toBeGreaterThan(0);
     expect(screen.getByText(/TEST-PU-REPORT/)).toBeInTheDocument();
     expect(screen.getAllByText("shared metric").length).toBeGreaterThan(0);
@@ -2445,10 +2455,15 @@ describe("App, authenticated", () => {
     render(<App />);
 
     expect(await screen.findByLabelText("Grouping comparison")).toBeInTheDocument();
-    expect(screen.getByRole("button", { name: /compare process_unit: demo report high/i })).toHaveTextContent(
-      "mean θ 0.81",
+    expect(
+      screen.getByRole("button", { name: "Compare Process unit: Demo Report High, mean θ 0.81" }),
+    ).toHaveTextContent("mean θ 0.81");
+    await userEvent.click(
+      screen.getByRole("button", { name: "Compare Thread group: A-100, mean θ 0.81" }),
+    );
+    expect(screen.getByRole("status")).toHaveTextContent(
+      "A-100 is the opened grouping. Read its mean θ and member posts below, then open a post.",
     );
-    await userEvent.click(screen.getByRole("button", { name: /compare thread_group: a-100/i }));
     await waitFor(() =>
       expect(fetchMock).toHaveBeenCalledWith(
         expect.stringContaining("/api/reports/thread_group/2026-W02"),
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 7c9b02229..921959e03 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -2092,6 +2092,30 @@ function CalendarPanel({
   );
 }
 
+const REPORT_GROUPING_LABELS: Record<string, string> = {
+  process_unit: "Process unit",
+  corporate_entity: "Corporate entity",
+  thread_group: "Thread group",
+};
+
+function comparisonGroupingTitle(groupingKind: string, groupingLabel: string): string {
+  return `${REPORT_GROUPING_LABELS[groupingKind] ?? groupingKind}: ${groupingLabel}`;
+}
+
+function comparisonChipAccessibleName(
+  groupingKind: string,
+  groupingLabel: string,
+  meanTheta: number,
+): string {
+  return `Compare ${comparisonGroupingTitle(groupingKind, groupingLabel)}, mean θ ${meanTheta.toFixed(2)}`;
+}
+
+function openedReportNextAction(groupingLabel: string): string {
+  return (
+    `${groupingLabel} is the opened grouping. Read its mean θ and member posts below, then open a post.`
+  );
+}
+
 function ReportsPanel({
   accessToken,
   canRebuild,
@@ -2124,12 +2148,6 @@ function ReportsPanel({
   const [rebuilding, setRebuilding] = useState(false);
   const openedComparisonRef = useRef<HTMLButtonElement | null>(null);
 
-  const groupingLabels: Record<string, string> = {
-    process_unit: "Process unit",
-    corporate_entity: "Corporate entity",
-    thread_group: "Thread group",
-  };
-
   function groupingIsOpened(groupingKind: string, groupingKey: string, groupingLabel?: string) {
     if (groupingKind !== grouping) {
       return false;
@@ -2227,7 +2245,11 @@ function ReportsPanel({
                     ? openedComparisonRef
                     : undefined
                 }
-                aria-label={`Compare ${row.grouping_kind}: ${row.grouping_label}`}
+                aria-label={comparisonChipAccessibleName(
+                  row.grouping_kind,
+                  row.grouping_label,
+                  row.mean_theta,
+                )}
                 aria-current={
                   groupingIsOpened(row.grouping_kind, row.grouping_key, row.grouping_label)
                     ? "true"
@@ -2239,7 +2261,7 @@ function ReportsPanel({
                 }}
               >
                 <span className="ticket-title">
-                  {groupingLabels[row.grouping_kind] ?? row.grouping_kind}: {row.grouping_label}
+                  {comparisonGroupingTitle(row.grouping_kind, row.grouping_label)}
                 </span>
                 <span className="post-badge">mean θ {row.mean_theta.toFixed(2)}</span>
                 <span className="post-badge">{row.post_count} posts</span>
@@ -2248,6 +2270,11 @@ function ReportsPanel({
           ))}
         </ul>
       )}
+      {openedGroupingLabel && (
+        <p className="post-meta" role="status">
+          {openedReportNextAction(openedGroupingLabel)}
+        </p>
+      )}
       {index && index.periods.length > 0 && (
         <ul className="ticket-list">
           {index.periods.map((row) => (
diff --git a/lineageweave/__init__.py b/lineageweave/__init__.py
index 2b38b4fcf..107bfdb6f 100644
--- a/lineageweave/__init__.py
+++ b/lineageweave/__init__.py
@@ -55,4 +55,4 @@
     "sentence_excerpts",
 ]
 
-__version__ = "0.99.0"
+__version__ = "1.0.0"
diff --git a/pyproject.toml b/pyproject.toml
index 4008b9f77..6510d6e3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "lineageweave"
-version = "0.99.0"
+version = "1.0.0"
 description = "Reconstructs git-branch-style lineage DAGs from scattered short records using multi-channel score fusion and LLM adjudication."
 readme = "README.md"
 license = { text = "MIT" }
diff --git a/uv.lock b/uv.lock
index 942b5fe16..7ea52e063 100644
--- a/uv.lock
+++ b/uv.lock
@@ -454,7 +454,7 @@ wheels = [
 
 [[package]]
 name = "lineageweave"
-version = "0.99.0"
+version = "1.0.0"
 source = { virtual = "." }
 dependencies = [
     { name = "certifi" },