diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 62855a0..1b0db90 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -59,6 +59,8 @@ jobs:
               swift test --package-path "$pkg"
             fi
           done
+          echo "==> Testing root package (CrowTests)..."
+          swift test
 
   shellcheck:
     name: Shell Lint
diff --git a/Makefile b/Makefile
index 7d91005..053882c 100644
--- a/Makefile
+++ b/Makefile
@@ -60,13 +60,15 @@ sign: release
 
 # --- Test ---
 
-test:
+test: $(XCFW)
 	@for pkg in Packages/*/; do \
 		if [ -d "$$pkg/Tests" ]; then \
 			echo "==> Testing $$(basename $$pkg)..."; \
 			swift test --package-path "$$pkg"; \
 		fi; \
 	done
+	@echo "==> Testing root package (CrowTests)..."
+	@swift test
 
 # --- Clean ---
 
diff --git a/Package.swift b/Package.swift
index 1a6834b..9d421df 100644
--- a/Package.swift
+++ b/Package.swift
@@ -56,5 +56,10 @@ let package = Package(
             ],
             path: "Sources/CrowCLI"
         ),
+        .testTarget(
+            name: "CrowTests",
+            dependencies: ["Crow"],
+            path: "Tests/CrowTests"
+        ),
     ]
 )
diff --git a/Sources/Crow/App/IssueTracker.swift b/Sources/Crow/App/IssueTracker.swift
index 37c3b9a..b086c12 100644
--- a/Sources/Crow/App/IssueTracker.swift
+++ b/Sources/Crow/App/IssueTracker.swift
@@ -233,7 +233,7 @@ final class IssueTracker {
             let stalePRs = staleCandidateURLs.isEmpty
                 ? []
                 : await fetchStalePRStates(urls: staleCandidateURLs)
-            let allKnownPRs = ghResult.viewerPRs + stalePRs
+            let allKnownPRs = Self.dedupedByURL(ghResult.viewerPRs + stalePRs)
 
             applyPRStatuses(viewerPRs: allKnownPRs)
 
@@ -291,7 +291,7 @@ final class IssueTracker {
         let rateLimit: GitHubRateLimit?
     }
 
-    private struct ViewerPR {
+    struct ViewerPR: Sendable {
         let number: Int
         let url: String
         let state: String          // OPEN / MERGED / CLOSED
@@ -306,12 +306,67 @@ final class IssueTracker {
         let failedCheckNames: [String]
         let latestReviewStates: [String]
 
-        struct LinkedIssue {
+        struct LinkedIssue: Sendable {
             let number: Int
             let repo: String
         }
     }
 
+    // MARK: - PR Dedup
+
+    /// State-rank precedence used when the same PR URL appears in multiple
+    /// source lists (viewer vs stale-PR follow-up). Higher rank wins.
+    nonisolated static func stateRank(_ state: String) -> Int {
+        switch state {
+        case "MERGED": return 3
+        case "CLOSED": return 2
+        case "OPEN":   return 1
+        default:       return 0
+        }
+    }
+
+    /// Merge two `ViewerPR` records for the same URL. The record with the
+    /// higher state rank wins the state/isDraft/number fields; empty fields
+    /// on the winner are backfilled from the loser so that (e.g.) an
+    /// OPEN→MERGED demotion mid-refresh still carries the checks/reviews
+    /// from the OPEN record (the stale-PR follow-up query leaves those
+    /// fields empty).
+    nonisolated static func mergePRRecords(_ lhs: ViewerPR, _ rhs: ViewerPR) -> ViewerPR {
+        let (winner, loser) = stateRank(lhs.state) >= stateRank(rhs.state)
+            ? (lhs, rhs) : (rhs, lhs)
+        return ViewerPR(
+            number: winner.number,
+            url: winner.url,
+            state: winner.state,
+            mergeable: winner.mergeable != "UNKNOWN" ? winner.mergeable : loser.mergeable,
+            reviewDecision: winner.reviewDecision.isEmpty ? loser.reviewDecision : winner.reviewDecision,
+            isDraft: winner.isDraft,
+            headRefName: winner.headRefName.isEmpty ? loser.headRefName : winner.headRefName,
+            baseRefName: winner.baseRefName.isEmpty ? loser.baseRefName : winner.baseRefName,
+            repoNameWithOwner: winner.repoNameWithOwner.isEmpty ? loser.repoNameWithOwner : winner.repoNameWithOwner,
+            linkedIssueReferences: winner.linkedIssueReferences.isEmpty ? loser.linkedIssueReferences : winner.linkedIssueReferences,
+            checksState: winner.checksState.isEmpty ? loser.checksState : winner.checksState,
+            failedCheckNames: winner.failedCheckNames.isEmpty ? loser.failedCheckNames : winner.failedCheckNames,
+            latestReviewStates: winner.latestReviewStates.isEmpty ? loser.latestReviewStates : winner.latestReviewStates
+        )
+    }
+
+    /// Collapse duplicate URLs using `mergePRRecords`, preserving first-seen
+    /// order so downstream iteration remains deterministic.
+    nonisolated static func dedupedByURL(_ prs: [ViewerPR]) -> [ViewerPR] {
+        var byURL: [String: ViewerPR] = [:]
+        var order: [String] = []
+        for pr in prs {
+            if let existing = byURL[pr.url] {
+                byURL[pr.url] = mergePRRecords(existing, pr)
+            } else {
+                byURL[pr.url] = pr
+                order.append(pr.url)
+            }
+        }
+        return order.compactMap { byURL[$0] }
+    }
+
     private static let consolidatedQuery = """
     query($openQuery: String!, $closedQuery: String!, $reviewQuery: String!) {
       openIssues: search(type: ISSUE, query: $openQuery, first: 100) {
@@ -869,7 +924,7 @@ final class IssueTracker {
     /// in the viewer-PR payload. No extra gh calls.
     private func applyPRStatuses(viewerPRs: [ViewerPR]) {
         guard !viewerPRs.isEmpty else { return }
-        let byURL = Dictionary(uniqueKeysWithValues: viewerPRs.map { ($0.url, $0) })
+        let byURL = Dictionary(viewerPRs.map { ($0.url, $0) }, uniquingKeysWith: Self.mergePRRecords)
 
         let sessionsWithPRs = appState.sessions.filter { $0.id != AppState.managerSessionID }
         for session in sessionsWithPRs {
@@ -957,7 +1012,7 @@ final class IssueTracker {
     /// closed accidentally.
     private func autoCompleteFinishedSessions(openIssues: [AssignedIssue], viewerPRs: [ViewerPR]) {
         let openIssueURLs = Set(openIssues.map(\.url))
-        let prsByURL = Dictionary(uniqueKeysWithValues: viewerPRs.map { ($0.url, $0) })
+        let prsByURL = Dictionary(viewerPRs.map { ($0.url, $0) }, uniquingKeysWith: Self.mergePRRecords)
 
         let candidateSessions = appState.sessions.filter {
             $0.id != AppState.managerSessionID &&
diff --git a/Tests/CrowTests/IssueTrackerDedupTests.swift b/Tests/CrowTests/IssueTrackerDedupTests.swift
new file mode 100644
index 0000000..88d818b
--- /dev/null
+++ b/Tests/CrowTests/IssueTrackerDedupTests.swift
@@ -0,0 +1,131 @@
+import Foundation
+import Testing
+@testable import Crow
+
+@Suite("IssueTracker PR dedup")
+struct IssueTrackerDedupTests {
+
+    private func makeViewerPR(
+        url: String,
+        state: String,
+        number: Int = 1,
+        mergeable: String = "UNKNOWN",
+        reviewDecision: String = "",
+        isDraft: Bool = false,
+        headRefName: String = "",
+        baseRefName: String = "",
+        repoNameWithOwner: String = "",
+        linkedIssueReferences: [IssueTracker.ViewerPR.LinkedIssue] = [],
+        checksState: String = "",
+        failedCheckNames: [String] = [],
+        latestReviewStates: [String] = []
+    ) -> IssueTracker.ViewerPR {
+        IssueTracker.ViewerPR(
+            number: number,
+            url: url,
+            state: state,
+            mergeable: mergeable,
+            reviewDecision: reviewDecision,
+            isDraft: isDraft,
+            headRefName: headRefName,
+            baseRefName: baseRefName,
+            repoNameWithOwner: repoNameWithOwner,
+            linkedIssueReferences: linkedIssueReferences,
+            checksState: checksState,
+            failedCheckNames: failedCheckNames,
+            latestReviewStates: latestReviewStates
+        )
+    }
+
+    @Test func collapsesExactDuplicates() {
+        let url = "https://github.com/radiusmethod/corveil/pull/201"
+        let prs = [
+            makeViewerPR(url: url, state: "OPEN"),
+            makeViewerPR(url: url, state: "OPEN"),
+        ]
+        let deduped = IssueTracker.dedupedByURL(prs)
+        #expect(deduped.count == 1)
+        #expect(deduped[0].url == url)
+    }
+
+    @Test func mergedBeatsOpenRegardlessOfOrder() {
+        let url = "https://github.com/radiusmethod/corveil/pull/201"
+        let open = makeViewerPR(url: url, state: "OPEN")
+        let merged = makeViewerPR(url: url, state: "MERGED")
+
+        let openFirst = IssueTracker.dedupedByURL([open, merged])
+        let mergedFirst = IssueTracker.dedupedByURL([merged, open])
+
+        #expect(openFirst.count == 1)
+        #expect(openFirst[0].state == "MERGED")
+        #expect(mergedFirst.count == 1)
+        #expect(mergedFirst[0].state == "MERGED")
+    }
+
+    @Test func mergedWinnerBackfillsEmptyFieldsFromOpenLoser() {
+        let url = "https://github.com/radiusmethod/corveil/pull/201"
+        let open = makeViewerPR(
+            url: url,
+            state: "OPEN",
+            reviewDecision: "APPROVED",
+            headRefName: "feature/x",
+            baseRefName: "main",
+            repoNameWithOwner: "radiusmethod/corveil",
+            checksState: "SUCCESS",
+            failedCheckNames: ["noop"],
+            latestReviewStates: ["APPROVED"]
+        )
+        let merged = makeViewerPR(url: url, state: "MERGED")
+
+        let result = IssueTracker.dedupedByURL([open, merged])
+        #expect(result.count == 1)
+        let pr = result[0]
+        #expect(pr.state == "MERGED")
+        #expect(pr.reviewDecision == "APPROVED")
+        #expect(pr.headRefName == "feature/x")
+        #expect(pr.baseRefName == "main")
+        #expect(pr.repoNameWithOwner == "radiusmethod/corveil")
+        #expect(pr.checksState == "SUCCESS")
+        #expect(pr.failedCheckNames == ["noop"])
+        #expect(pr.latestReviewStates == ["APPROVED"])
+    }
+
+    @Test func mergedWinsThreeWay() {
+        let url = "https://github.com/radiusmethod/corveil/pull/201"
+        let prs = [
+            makeViewerPR(url: url, state: "OPEN"),
+            makeViewerPR(url: url, state: "CLOSED"),
+            makeViewerPR(url: url, state: "MERGED"),
+        ]
+        let result = IssueTracker.dedupedByURL(prs)
+        #expect(result.count == 1)
+        #expect(result[0].state == "MERGED")
+    }
+
+    @Test func preservesFirstSeenOrderAcrossDistinctURLs() {
+        let a = makeViewerPR(url: "https://example/a", state: "OPEN", number: 1)
+        let b = makeViewerPR(url: "https://example/b", state: "OPEN", number: 2)
+        let c = makeViewerPR(url: "https://example/c", state: "OPEN", number: 3)
+
+        let result = IssueTracker.dedupedByURL([a, b, c])
+        #expect(result.map(\.url) == ["https://example/a", "https://example/b", "https://example/c"])
+    }
+
+    @Test func dictionaryUniquingWithMergeRecordsDoesNotTrap() {
+        // Guard for the belt-and-suspenders call sites at
+        // applyPRStatuses / autoCompleteFinishedSessions. If a future
+        // refactor regresses dedup at the assembly site, these call sites
+        // must still tolerate duplicates instead of trapping.
+        let url = "https://github.com/radiusmethod/corveil/pull/201"
+        let prs = [
+            makeViewerPR(url: url, state: "OPEN"),
+            makeViewerPR(url: url, state: "MERGED"),
+        ]
+        let byURL = Dictionary(
+            prs.map { ($0.url, $0) },
+            uniquingKeysWith: IssueTracker.mergePRRecords
+        )
+        #expect(byURL.count == 1)
+        #expect(byURL[url]?.state == "MERGED")
+    }
+}