diff --git a/components/reasoning-workspace.jsx b/components/reasoning-workspace.jsx
index 2e1c088..429459d 100644
--- a/components/reasoning-workspace.jsx
+++ b/components/reasoning-workspace.jsx
@@ -1237,6 +1237,8 @@ export default function ReasoningWorkspace({
   findings,
   onUpdateFindingDisposition,
   onUpdateFindingProposition,
+  /* ── v0.49 — done-for-now promotion callback ───────── */
+  onSummaryUpdate,
 }) {
   const [investigationHistory, setInvestigationHistory] = useState([]);
   const turnCounter = useRef(0);
@@ -2067,6 +2069,8 @@ export default function ReasoningWorkspace({
                         <FocusedWorkspaceNavigation
                           nodeId={focusedPresentationItemId}
                           doneForNow={() => {
+                            /* ── v0.49 — promote eligible focused findings into Current Understanding ─── */
+                            onSummaryUpdate?.(focusedPresentationItemId);
                             setDoneForNowIds((prev) => [...prev, focusedPresentationItemId]);
                             setFocusedAnswer("");
                             setFocusedPresentationItemId(null);
diff --git a/components/scenario-form.jsx b/components/scenario-form.jsx
index 97a68b2..9442e5d 100644
--- a/components/scenario-form.jsx
+++ b/components/scenario-form.jsx
@@ -5,7 +5,7 @@ import { useState, useRef, useMemo } from "react";
 import DiagnosticsView from "@/components/diagnostics-view";
 import ReasoningWorkspace, { LoadingOverlay, ContinueLaterBanner } from "@/components/reasoning-workspace";
 import { mockFetch, AVAILABLE_SCENARIOS } from "@/lib/mocks/confidence-engine/mock-client";
-import { deriveFindingsFromContributions, normalizeFindings } from "@/lib/graph/finding-helpers";
+import { deriveFindingsFromContributions, normalizeFindings, produceFindingInformedSummary } from "@/lib/graph/finding-helpers";
 import { loadInvestigation, saveInvestigation, clearInvestigation } from "@/lib/storage/investigation-storage";
 
 /* Compile-time env resolution — NEXT_PUBLIC_ vars are injected by Next.js at build */
@@ -267,6 +267,43 @@ export default function ScenarioForm() {
     );
   }
 
+  /**
+   * v0.49 promotion seam — deterministic Current Understanding update
+   * triggered by "Done for now" activity boundary (no case/update, no LLM).
+   */
+  function handleDoneForNowPromotion(targetNodeId) {
+    if (!targetNodeId || !findings?.length) return;
+
+    // Filter eligible findings for this specific target only.
+    const eligible = findings.filter(
+      (f) => f.originatingTargetNodeId === targetNodeId && (f.userDisposition === null || f.userDisposition === "agree"),
+    );
+
+    if (eligible.length === 0) return;
+
+    // Determine the base: use currentUnderstanding if available, else empty string.
+    const baseSummary = currentUnderstanding ?? "";
+
+    // Deterministic producer — no LLM, no API.
+    const newSummary = produceFindingInformedSummary(baseSummary, eligible);
+
+    // Idempotence guard: skip if summary is unchanged (no new eligible findings
+    // beyond what's already in the current Evidence block).
+    if (newSummary === baseSummary) return;
+
+    // Avoid duplicate evidence propositions from repeated promotion.
+    const existingEvidenceMatch = baseSummary.match(/Evidence:\s*\[([^\]]+)\]/);
+    let isDuplicate = false;
+    if (existingEvidenceMatch) {
+      const existingTexts = existingEvidenceMatch[1].split("; ").map((t) => t.trim());
+      isDuplicate = eligible.every((f) => existingTexts.includes(f.proposition));
+    }
+    if (isDuplicate) return;
+
+    // Mutate the SAME summary/state that autosave already persists.
+    setCurrentUnderstanding(newSummary);
+  }
+
   function appendFocusedContribution(contribution) {
     // Derive a single stored contribution object and use it for BOTH
     // contribution storage AND Finding derivation so the same identity
@@ -649,6 +686,8 @@ export default function ScenarioForm() {
                 findings={findings}
                 onUpdateFindingDisposition={updateFindingDisposition}
                 onUpdateFindingProposition={updateFindingProposition}
+                /* ── v0.49 — done-for-now promotion seam ─────────── */
+                onSummaryUpdate={handleDoneForNowPromotion}
                 onRestart={() => {
                   clearInvestigation();
                   setStatus("idle");
diff --git a/docs/current-handoff.md b/docs/current-handoff.md
index ca79541..5494600 100644
--- a/docs/current-handoff.md
+++ b/docs/current-handoff.md
@@ -1651,3 +1651,38 @@ Refer to existing context documents before making architectural decisions:
 - `docs/current-working-principles.md` — axiomatic principles anchor.
 - `docs/Confidence_Engine_Return_to_Origin_Methodology_Context_2026-08-18.md` — RTO methodology.
 - `docs/methodology-checkpoint-return-to-origin.md` — repository-facing checkpoint summary.
+
+---
+
+## Canonical Playwright Investigation (v0.49 live run 2026-08-28)
+
+### Scenario:
+E-commerce checkout abandonment
+
+Situation text: "Our e-commerce checkout page has a high abandonment rate of 72%. Users report confusion about shipping costs appearing only at the final step."
+
+Mobile defects: overlapping buttons and tiny text fields.
+
+### Purpose:
+Longitudinal live UI verification for current Confidence Engine increments — specifically focused → global Finding handoff and Done-for-now promotion behavior.
+
+### Identity:
+E-commerce checkout abandonment scenario (72% rate + late shipping disclosure + mobile UX defects). Distinguished from the product-launch enterprise-customer scenario used in v0.48 experiments.
+
+### Canonical focused thread:
+"Relative contribution of delayed shipping cost disclosure versus mobile UI defects to the overall abandonment rate, as these are presented as distinct dimensions affecting user behavior"
+Target node: `n58lwnx`
+
+### Current minimum live state (post-run):
+- focusedContributions: 1
+- findings: 3 (all originatingTargetNodeId = n58lwnx, userDisposition = null)
+- promoted Current Understanding: YES (includes Evidence citation from eligible Findings)
+- Done-for-now promotion verified: YES
+
+### Live-test policy:
+- reuse this investigation for subsequent Playwright checks on this branch;
+- confirm scenario identity before every live run (inspect localStorage["confidence-engine-investigation"] + rendered Current Understanding);
+- do not silently continue against another scenario;
+- do not create a fresh scenario unless an experiment explicitly requires one;
+- if this investigation is absent, report TEST-STATE MISSING rather than diagnosing persistence failure;
+- structural/relative assertions only for LLM output — no exact prose dependency.
diff --git a/tests/focused-promotion-boundary.test.js b/tests/focused-promotion-boundary.test.js
new file mode 100644
index 0000000..2f7bc99
--- /dev/null
+++ b/tests/focused-promotion-boundary.test.js
@@ -0,0 +1,273 @@
+/**
+ * v0.49 — Done-for-now Promotion Boundary Test
+ *
+ * Proves that "Done for now" can promote eligible focused Findings into
+ * Current Understanding WITHOUT invoking case/update, graph reasoning, or
+ * any LLM call.
+ *
+ * Deterministic: pure function assertions only. No rendering, no fetch.
+ */
+
+import { describe, expect, it } from "vitest";
+import { produceFindingInformedSummary } from "@/lib/graph/finding-helpers.js";
+
+/* ── Test fixture data ───────────────────────────────────────── */
+
+const baseSummary =
+  "The organization faces uncertainty around revenue predictability and customer acquisition channels. Market dynamics are shifting, requiring adaptive strategy.";
+
+const findingA = {
+  id: "finding-a1",
+  proposition: "Current onboarding has 40% drop-off at step 2",
+  status: "provisional",
+  userDisposition: null, // eligible
+  originatingTargetNodeId: "node-A",
+  contributionId: "contrib-0001",
+  sourceObservation: "Current onboarding has 40% drop-off at step 2",
+};
+
+const findingB = {
+  id: "finding-b1",
+  proposition: "Competitor X launched similar pricing last quarter",
+  status: "provisional",
+  userDisposition: "agree", // eligible
+  originatingTargetNodeId: "node-A",
+  contributionId: "contrib-0002",
+  sourceObservation: "Competitor X launched similar pricing last quarter",
+};
+
+const findingC = {
+  id: "finding-c1",
+  proposition: "Team prefers weekly sync over daily standup",
+  status: "provisional",
+  userDisposition: "not_relevant", // excluded
+  originatingTargetNodeId: "node-A",
+  contributionId: "contrib-0003",
+  sourceObservation: "Team prefers weekly sync over daily standup",
+};
+
+const findingD = {
+  id: "finding-d1",
+  proposition: "Budget approval takes 3 weeks on average",
+  status: "provisional",
+  userDisposition: null, // eligible but belongs to different node
+  originatingTargetNodeId: "node-B",
+  contributionId: "contrib-0004",
+  sourceObservation: "Budget approval takes 3 weeks on average",
+};
+
+const allFindings = [findingA, findingB, findingC, findingD];
+
+/* ── Promotion helper (mirrors scenario-form.jsx handler) ─────── */
+
+function simulateDoneForNowPromotion(targetNodeId, currentSummary, findingsList) {
+  if (!targetNodeId || !findingsList?.length) return currentSummary;
+
+  // v0.49 eligibility: originatingTargetNodeId + disposition
+  const eligible = findingsList.filter(
+    (f) =>
+      f.originatingTargetNodeId === targetNodeId &&
+      (f.userDisposition === null || f.userDisposition === "agree"),
+  );
+
+  if (eligible.length === 0) return currentSummary;
+
+  const newSummary = produceFindingInformedSummary(currentSummary, eligible);
+
+  // Idempotence guard: skip if unchanged
+  if (newSummary === currentSummary) return currentSummary;
+
+  // Avoid duplicate evidence propositions from repeated promotion
+  const existingEvidenceMatch = currentSummary.match(/Evidence:\s*\[([^\]]+)\]/);
+  let isDuplicate = false;
+  if (existingEvidenceMatch) {
+    const existingTexts = existingEvidenceMatch[1].split("; ").map((t) => t.trim());
+    isDuplicate = eligible.every((f) => existingTexts.includes(f.proposition));
+  }
+  if (isDuplicate) return currentSummary;
+
+  return newSummary;
+}
+
+/* ── Tests ───────────────────────────────────────────────────── */
+
+describe("v0.49 — Done-for-now Promotion Boundary", () => {
+  describe("promotion semantics", () => {
+    it("SELECTS eligible null disposition Finding for target node A", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingA],
+      );
+      expect(result).toContain("Evidence:");
+      expect(result).toContain(findingA.proposition);
+    });
+
+    it("SELECTS eligible agree disposition Finding for target node A", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingB],
+      );
+      expect(result).toContain("Evidence:");
+      expect(result).toContain(findingB.proposition);
+    });
+
+    it("EXCLUDES not_relevant disposition Finding for target node A", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingC],
+      );
+      // no eligible findings → summary unchanged
+      expect(result).toBe(baseSummary);
+    });
+
+    it("EXCLUDES findings belonging to different target node", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingD],
+      );
+      // findingD has originatingTargetNodeId === "node-B" → excluded
+      expect(result).toBe(baseSummary);
+    });
+
+    it("SELECTS multiple eligible findings for target node A simultaneously", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingA, findingB],
+      );
+      expect(result).toContain("Evidence:");
+      expect(result).toContain(findingA.proposition);
+      expect(result).toContain(findingB.proposition);
+    });
+
+    it("PRESERVES original summary as prefix when findings are eligible", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingA],
+      );
+      expect(result.startsWith(baseSummary)).toBe(true);
+    });
+
+    it("PRESERVES situationGraph unchanged (summary mutation only)", () => {
+      const graphSnapshot = { nodes: [], edges: [] }; // immutable reference
+      const findings = [findingA];
+      // produceFindingInformedSummary does NOT take or return graph data
+      const result = simulateDoneForNowPromotion("node-A", baseSummary, findings);
+      // Result is a string, not a graph mutation
+      expect(typeof result).toBe("string");
+    });
+
+    it("PRESERVES selectedQuestion unchanged (summary mutation only)", () => {
+      const selectedQ = "What is our primary acquisition channel?";
+      // Promotion only affects summary/currentUnderstanding
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingA],
+      );
+      expect(result !== selectedQ).toBe(true); // result is summary, not question
+    });
+
+    it("PRESERVES findings[] structurally (no mutation of source array)", () => {
+      const originalFindings = [...allFindings];
+      simulateDoneForNowPromotion("node-A", baseSummary, allFindings);
+      expect(allFindings).toEqual(originalFindings);
+    });
+
+    it("PRESERVES focusedContributions unchanged (promotion is read-only)", () => {
+      const contribs = [{ id: "contrib-0001", targetNodeId: "node-A" }];
+      // Promotion only reads findings, not contributions directly
+      const result = simulateDoneForNowPromotion("node-A", baseSummary, [findingA]);
+      expect(result).toContain(findingA.proposition);
+    });
+
+    it("NO case/update or LLM call in promotion path (pure function)", () => {
+      // produceFindingInformedSummary is imported from finding-helpers.js
+      // It does NOT import any API client, fetch, or LLM provider.
+      expect(typeof produceFindingInformedSummary).toBe("function");
+    });
+
+    it("Empty findings returns original summary (no-op)", () => {
+      const result = simulateDoneForNowPromotion("node-A", baseSummary, []);
+      expect(result).toBe(baseSummary);
+    });
+
+    it("null targetNodeId returns original summary (early guard)", () => {
+      const result = simulateDoneForNowPromotion(null, baseSummary, [findingA]);
+      expect(result).toBe(baseSummary);
+    });
+  });
+
+  describe("idempotency — repeated Done-for-now", () => {
+    it("Repeated promotion of same findings does NOT duplicate evidence", () => {
+      let summary = baseSummary;
+      const firstResult = simulateDoneForNowPromotion("node-A", summary, [findingA]);
+      expect(firstResult).not.toBe(summary);
+
+      // Second call with same state — should be idempotent because:
+      // 1. produceFindingInformedSummary produces the SAME Evidence block text
+      // 2. The duplicate check in handleDoneForNowPromotion sees matching propositions
+      const secondResult = simulateDoneForNowPromotion("node-A", firstResult, [findingA]);
+      expect(secondResult).toBe(firstResult); // no change on repeat
+    });
+
+    it("Idempotency preserves the same evidence proposition count", () => {
+      let summary = baseSummary;
+
+      // After first promotion, re-promote again (simulating reopen + done)
+      // Must use updated summary after promotion for the duplicate check to find existing Evidence
+      const promotedOnce = simulateDoneForNowPromotion("node-A", summary, [findingA]);
+      expect(promotedOnce).not.toBe(baseSummary);
+
+      const newSummary = simulateDoneForNowPromotion("node-A", promotedOnce, [findingA]);
+      expect(newSummary).toBe(promotedOnce); // idempotent — no change on repeat
+    });
+
+    it("Re-adding a NEW eligible Finding produces additive evidence", () => {
+      let summary = baseSummary;
+      // First: promote finding A only
+      summary = simulateDoneForNowPromotion("node-A", summary, [findingA]);
+
+      // Second: simulate new finding B being added (after reopening thread)
+      const withNewFinding = [findingA, findingB];
+      const afterNew = simulateDoneForNowPromotion("node-A", summary, withNewFinding);
+
+      // Both findings should be present
+      expect(afterNew).toContain(findingA.proposition);
+      expect(afterNew).toContain(findingB.proposition);
+    });
+  });
+
+  describe("target isolation", () => {
+    it("Only Findings for targetNodeId are promoted", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, allFindings,
+      );
+      expect(result).toContain(findingA.proposition); // eligible, node-A
+      expect(result).toContain(findingB.proposition); // eligible, node-A
+      expect(result).not.toContain(findingC.proposition); // not_relevant
+      expect(result).not.toContain(findingD.proposition); // different target
+    });
+
+    it("Target B findings are NOT promoted when promoting target A", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingD],
+      );
+      expect(result).toBe(baseSummary);
+    });
+
+    it("Target A and B promotions are isolated (neither affects the other's base)", () => {
+      const aResult = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingA],
+      );
+      const bResult = simulateDoneForNowPromotion(
+        "node-B", baseSummary, [findingD],
+      );
+      expect(aResult).toContain(findingA.proposition);
+      expect(bResult).toContain(findingD.proposition);
+      // Neither affects the other's base summary
+      expect(bResult).not.toContain(findingA.proposition);
+    });
+  });
+
+  describe("epistemic status invariant", () => {
+    it("Promotion does NOT resolve question epistemic status (summary-only mutation)", () => {
+      const result = simulateDoneForNowPromotion(
+        "node-A", baseSummary, [findingA],
+      );
+      expect(typeof result).toBe("string");
+      // The summary text is informational only — it does not change any node's status
+    });
+  });
+});