diff --git a/.changes/unreleased/+apt-transaction-empty-marker.yaml b/.changes/unreleased/+apt-transaction-empty-marker.yaml
new file mode 100644
index 00000000..51755047
--- /dev/null
+++ b/.changes/unreleased/+apt-transaction-empty-marker.yaml
@@ -0,0 +1,2 @@
+kind: Fixed
+body: Accept valid APT install transaction records with one trailing empty marker.
diff --git a/docs/BACKLOG.md b/docs/BACKLOG.md
index dcff50ac..d8f0d6be 100644
--- a/docs/BACKLOG.md
+++ b/docs/BACKLOG.md
@@ -1,6 +1,6 @@
 ---
 status: Active
-updated: 2026-08-04
+updated: 2026-08-14
 summary: Active planning surface for Reploy design and implementation gaps.
 ---
 
@@ -31,14 +31,6 @@ This file is the day-to-day queue for design and implementation gaps.
 
 ## Pre-release
 
-- [ ] `P1` Accept APT install transaction records with the optional trailing
-      empty marker. Current APT versions may emit valid `Inst` records ending
-      in `) []`, which Reploy currently rejects as malformed. Accept exactly
-      the known optional ` []` suffix while preserving the existing package,
-      version, and architecture checks. Add regression coverage for ordinary
-      installs and upgrades, streaming chunk boundaries, and rejection of
-      nonempty, duplicated, or otherwise malformed trailing markers.
-
 - [ ] `P2` Add explicit controlled runtime command aliases for validated
       executable outputs. Keep provider exports non-public by default, and let
       a blueprint opt into mapping ordinary command names such as `rustc` to
@@ -167,6 +159,13 @@ This file is the day-to-day queue for design and implementation gaps.
 
 ## Post-v1
 
+- [ ] `P2` Inventory and organize the repository `temp/` directory.
+      Identify which files are disposable scratch artifacts, active private
+      working notes, or durable project documentation. Remove obsolete files
+      only after explicit review, move durable documents to an appropriate
+      maintained location, and leave `temp/` with a small documented purpose
+      and structure that prevents it from becoming an unindexed document store.
+
 - [ ] `P2` Design explicit remote Docker support.
       Replace today's rejected ambient `DOCKER_HOST` and remote-context behavior
       with an intentional distributed-runtime contract. Define input snapshot
diff --git a/internal/providers/apt/resolve_install.go b/internal/providers/apt/resolve_install.go
index 322f0b8f..07c3308b 100644
--- a/internal/providers/apt/resolve_install.go
+++ b/internal/providers/apt/resolve_install.go
@@ -107,6 +107,7 @@ func (parser *ResolveInstallParserV1) consumeLine(line []byte) error {
 		current = detail[1:end]
 		detail = detail[end+2:]
 	}
+	detail = strings.TrimSuffix(detail, " []")
 	if len(detail) < 5 || detail[0] != '(' || detail[len(detail)-1] != ')' {
 		return fmt.Errorf("APT install transaction record for package %q is malformed", name)
 	}
diff --git a/internal/providers/apt/resolve_plan_test.go b/internal/providers/apt/resolve_plan_test.go
index e426388a..2bb1913e 100644
--- a/internal/providers/apt/resolve_plan_test.go
+++ b/internal/providers/apt/resolve_plan_test.go
@@ -115,6 +115,56 @@ func TestResolveInstallParserCompletesUpgradedDependencyClosure(t *testing.T) {
 	}
 }
 
+func TestResolveInstallParserAcceptsOptionalEmptyMarkerAcrossChunks(t *testing.T) {
+	parser, err := NewResolveInstallParserV1("amd64")
+	if err != nil {
+		t.Fatal(err)
+	}
+	chunks := []string{
+		"Inst dovecot-sieve (1:2.4.1-4 Debian:13/stable [amd64]) [",
+		"]\nInst libssl3t64 [3.0.13-0ubuntu3.11] ",
+		"(3.0.13-0ubuntu3.12 Ubuntu:24.04/noble-updates [amd64]) []\n",
+	}
+	for _, chunk := range chunks {
+		if _, err := parser.Write([]byte(chunk)); err != nil {
+			t.Fatal(err)
+		}
+	}
+	changes, err := parser.Finish()
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []ResolvePlanPackageV1{
+		{Name: "dovecot-sieve", ResolverArchitecture: "amd64", SelectedVersion: "1:2.4.1-4"},
+		{Name: "libssl3t64", ResolverArchitecture: "amd64", CurrentVersion: "3.0.13-0ubuntu3.11", SelectedVersion: "3.0.13-0ubuntu3.12"},
+	}
+	if !reflect.DeepEqual(changes, want) {
+		t.Fatalf("changes = %#v, want %#v", changes, want)
+	}
+}
+
+func TestResolveInstallParserRejectsMalformedTrailingMarkers(t *testing.T) {
+	tests := []string{
+		"Inst hello (2.10-3 Debian:13/stable [amd64]) [amd64]\n",
+		"Inst hello (2.10-3 Debian:13/stable [amd64]) [] []\n",
+		"Inst hello (2.10-3 Debian:13/stable [amd64]) [ ]\n",
+		"Inst hello (2.10-3 Debian:13/stable [amd64])[]\n",
+		"Inst hello (2.10-3 Debian:13/stable [amd64]) [] extra\n",
+	}
+	for _, input := range tests {
+		t.Run(input, func(t *testing.T) {
+			parser, err := NewResolveInstallParserV1("amd64")
+			if err != nil {
+				t.Fatal(err)
+			}
+			_, _ = parser.Write([]byte(input))
+			if _, err := parser.Finish(); err == nil || !strings.Contains(err.Error(), "malformed") {
+				t.Fatalf("err = %v, want malformed record", err)
+			}
+		})
+	}
+}
+
 func TestCompleteResolvePlanRejectsMissingAndConflictingInstallEvidence(t *testing.T) {
 	marker := ResolvePlanV1{Schema: ResolvePlanSchemaV1, Packages: []ResolvePlanPackageV1{{
 		Name: "hello", ResolverArchitecture: "amd64", SelectedVersion: "1",