diff --git a/changelog.d/8841-release-parity-budget.md b/changelog.d/8841-release-parity-budget.md
index 92247d1c99..85db32aef5 100644
--- a/changelog.d/8841-release-parity-budget.md
+++ b/changelog.d/8841-release-parity-budget.md
@@ -1 +1 @@
-- Keep release-grade parity CI viable as the corpus grows by spreading it over twelve shards, adding timeout margin, and tracking the Linux Parcel watcher facade mismatch surfaced by the v0.5.1519 candidate.
+- Keep release-grade parity CI viable as the corpus grows by spreading it over twelve shards, adding timeout margin, and ratcheting the Linux Parcel watcher and HTTP Agent lifecycle gaps surfaced by the v0.5.1519 candidates.
diff --git a/changelog.d/8851-release-main-warnings.md b/changelog.d/8851-release-main-warnings.md
new file mode 100644
index 0000000000..f42e6fb4c5
--- /dev/null
+++ b/changelog.d/8851-release-main-warnings.md
@@ -0,0 +1 @@
+- Restore warning-clean compiler builds after the packed-loop index-store lowering was split into its own module.
diff --git a/crates/perry-codegen/src/expr/index_set.rs b/crates/perry-codegen/src/expr/index_set.rs
index ec4d963473..f7165ed449 100644
--- a/crates/perry-codegen/src/expr/index_set.rs
+++ b/crates/perry-codegen/src/expr/index_set.rs
@@ -39,20 +39,17 @@ use crate::rooting;
 use crate::type_analysis::{is_array_expr, is_numeric_expr, is_string_expr, receiver_class_name};
 use crate::types::{DOUBLE, I32, I64};
 
-use super::index_set_packed_loop::{
-    lower_packed_f64_range_loop_index_set, lower_packed_numeric_loop_index_set,
-};
+use super::index_set_packed_loop::lower_packed_numeric_loop_index_set;
 use super::index_set_typed_array::lower_inline_dyn_typed_array_set;
 use super::{
-    array_kind_fact, array_store_needs_layout_note, array_store_needs_write_barrier,
+    array_store_needs_layout_note, array_store_needs_write_barrier,
     attach_buffer_view_pointer_state_for_expr, buffer_access_materialization_reason,
     emit_array_numeric_write_note_on_block, emit_jsvalue_slot_store_on_block,
     emit_root_nanbox_store_on_block, emit_typed_feedback_register_site, emit_write_barrier,
     expr_has_numeric_pointer_free_array_layout, int_range_expr, lower_buffer_store, lower_expr,
-    lower_expr_as_i32, lower_expr_native, lower_index_set_fast, lower_typed_array_store,
-    materialize_js_value, nanbox_pointer_inline, raw_f64_layout_fact, unbox_str_handle,
-    unbox_to_i64, BufferAccessSpec, FnCtx, PackedF64LoopFact, PackedNumericLoopKind,
-    TypedFeedbackContract, TypedFeedbackKind,
+    lower_expr_native, lower_index_set_fast, lower_typed_array_store, materialize_js_value,
+    nanbox_pointer_inline, raw_f64_layout_fact, unbox_str_handle, unbox_to_i64, BufferAccessSpec,
+    FnCtx, PackedF64LoopFact, PackedNumericLoopKind, TypedFeedbackContract, TypedFeedbackKind,
 };
 
 pub(super) fn canonicalize_raw_f64_numeric_store_value(
diff --git a/crates/perry-codegen/src/expr/index_set_packed_loop.rs b/crates/perry-codegen/src/expr/index_set_packed_loop.rs
index d27e1f7676..f9d640e4a3 100644
--- a/crates/perry-codegen/src/expr/index_set_packed_loop.rs
+++ b/crates/perry-codegen/src/expr/index_set_packed_loop.rs
@@ -4,30 +4,18 @@
 //! Split out of `index_set.rs` to keep it under the 2,000-line file gate.
 
 use anyhow::Result;
-use perry_hir::{BinaryOp, Expr};
+use perry_hir::Expr;
 
-use crate::nanbox::{double_literal, POINTER_MASK_I64};
+use crate::nanbox::POINTER_MASK_I64;
 use crate::native_value::{
-    BoundsState, BufferAccessMode, ExpectedNativeRep, LoweredValue, MaterializationReason,
-    NativeRep, SemanticKind,
+    BoundsState, BufferAccessMode, LoweredValue, MaterializationReason, NativeRep, SemanticKind,
 };
-use crate::rooting;
-use crate::type_analysis::{is_array_expr, is_numeric_expr, is_string_expr, receiver_class_name};
 use crate::types::{DOUBLE, I32, I64};
 
 use super::index_set::{canonicalize_raw_f64_numeric_store_value, packed_f64_loop_fact};
-use super::index_set_typed_array::lower_inline_dyn_typed_array_set;
-use super::*;
 use super::{
-    array_kind_fact, array_store_needs_layout_note, array_store_needs_write_barrier,
-    attach_buffer_view_pointer_state_for_expr, buffer_access_materialization_reason,
-    emit_array_numeric_write_note_on_block, emit_jsvalue_slot_store_on_block,
-    emit_root_nanbox_store_on_block, emit_typed_feedback_register_site, emit_write_barrier,
-    expr_has_numeric_pointer_free_array_layout, int_range_expr, lower_buffer_store, lower_expr,
-    lower_expr_as_i32, lower_expr_native, lower_index_set_fast, lower_typed_array_store,
-    materialize_js_value, nanbox_pointer_inline, raw_f64_layout_fact, unbox_str_handle,
-    unbox_to_i64, BufferAccessSpec, FnCtx, PackedF64LoopFact, PackedNumericLoopKind,
-    TypedFeedbackContract, TypedFeedbackKind,
+    array_kind_fact, emit_typed_feedback_register_site, lower_expr, lower_expr_as_i32,
+    raw_f64_layout_fact, FnCtx, PackedNumericLoopKind, TypedFeedbackContract, TypedFeedbackKind,
 };
 
 fn lower_packed_f64_loop_store_value(
diff --git a/test-parity/known_failures.json b/test-parity/known_failures.json
index f8a2143273..0f76440ed3 100644
--- a/test-parity/known_failures.json
+++ b/test-parity/known_failures.json
@@ -430,6 +430,15 @@
       "linux"
     ]
   },
+  "test_issue_4975_http_agent_keep_alive_connection_options": {
+    "issue": "8841",
+    "added": "2026-08-26",
+    "category": "bug-open",
+    "reason": "Release run 32935157745: Node exits 0, while Perry prints the expected keepAlive and keepAliveInitialDelay values but does not terminate before the 10s harness deadline. Track the Agent/socket lifecycle gap after server.close(); remove this entry with the fix tracked in #8841.",
+    "platforms": [
+      "linux"
+    ]
+  },
   "test_issue_4977_gc_toplevel_locals": {
     "issue": "8271",
     "added": "2026-08-17",