diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7c910c54..84c468191 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -168,6 +168,12 @@ provider-supplied download URLs.
   three threads (#192).
 - Benchmark scripts run on machines other than the one they were written
   on (napi artifact resolved from platform/arch, SDKs from npm) (#160).
+- **Flutter package size**: the iOS static-lib slices carried fat-LTO
+  LLVM bitcode (~80% of each slice) plus debug symbols because a
+  `staticlib` never goes through cargo's link step — the 0.5.0 xcframework
+  hit pub.dev's 256MiB uncompressed package limit and was rejected. The
+  iOS build now uses an LTO-off profile and strips debug/local symbols:
+  each slice drops from ~128MB to ~15MB.
 
 ### Removed
 
diff --git a/Cargo.toml b/Cargo.toml
index 403484ef2..72caa4314 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,6 +31,15 @@ panic = "abort"
 strip = true
 opt-level = "z"
 
+# staticlib archives (.a) never reach a link step under cargo — the
+# consumer's toolchain links them — so fat-LTO only embeds every crate's
+# LLVM bitcode into the archive (.llvmbc on ELF, __LLVM,__bitcode on
+# Mach-O): ~80% of each iOS xcframework slice, past pub.dev's 256MiB
+# package limit since 0.5.0. Used by scripts/build-ios-xcframework.sh.
+[profile.ios-release]
+inherits = "release"
+lto = false
+
 [workspace.dependencies]
 # Async runtime
 tokio = { version = "1", features = ["full"] }
diff --git a/bindings/flutter/CHANGELOG.md b/bindings/flutter/CHANGELOG.md
index 6ea7af48f..3327a9844 100644
--- a/bindings/flutter/CHANGELOG.md
+++ b/bindings/flutter/CHANGELOG.md
@@ -1,3 +1,16 @@
+## 0.5.0
+
+- Breaking release aligning the whole aimux family — see the
+  [main CHANGELOG](https://github.com/arcships/aimux/blob/master/CHANGELOG.md)
+  for the complete list (stable cross-language error model, request
+  pipeline retries/timeouts, Core-boundary tool-input validation, host-side
+  `repairToolCall`, WS proxy, SSRF hardening).
+- Flutter binding: typed error model with retry context, host-side
+  `repairToolCall`, `VideoPollOptions`.
+- The embedded iOS `aimux_ffi.xcframework` no longer carries LTO bitcode /
+  debug symbols: each slice shrinks from ~128MB to ~15MB (the 0.3.0
+  archives had grown past pub.dev's 256MB package limit).
+
 ## 0.2.1
 
 - First pub.dev release under publisher `arcships.ai`.
diff --git a/scripts/build-ios-xcframework.sh b/scripts/build-ios-xcframework.sh
index 8df9b3b57..660ffaa7f 100644
--- a/scripts/build-ios-xcframework.sh
+++ b/scripts/build-ios-xcframework.sh
@@ -13,11 +13,18 @@ set -euo pipefail
 
 OUT="${1:?usage: build-ios-xcframework.sh <output-dir>}"
 ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+VERSION="$(grep -m1 '^version = ' Cargo.toml | sed 's/version = "\(.*\)"/\1/')"
 cd "$ROOT"
 
+# A staticlib is never linked here — the consumer's Xcode link step runs
+# after LTO stops mattering — so the workspace's fat-LTO only bloats the
+# archive: cargo passes -C embed-bitcode=yes and every codegen unit carries
+# its full LLVM bitcode (~80% of each slice, ~256MB uncompressed past
+# pub.dev's package limit since 0.5.0). The ios-release profile turns LTO
+# off for this build only; the size gate below fails loudly if that regresses.
 rustup target add aarch64-apple-ios aarch64-apple-ios-sim
-cargo build -p aimux-ffi --release --target aarch64-apple-ios
-cargo build -p aimux-ffi --release --target aarch64-apple-ios-sim
+cargo build -p aimux-ffi --profile ios-release --target aarch64-apple-ios
+cargo build -p aimux-ffi --profile ios-release --target aarch64-apple-ios-sim
 
 TMP="$(mktemp -d)"
 trap 'rm -rf "$TMP"' EXIT
@@ -28,7 +35,18 @@ for triple in aarch64-apple-ios aarch64-apple-ios-sim; do
     aarch64-apple-ios-sim) slice=sim ;;
   esac
   mkdir -p "$TMP/$slice/aimux_ffi.framework"
-  cp "target/$triple/release/libaimux_ffi.a" "$TMP/$slice/aimux_ffi.framework/aimux_ffi"
+  cp "target/$triple/ios-release/libaimux_ffi.a" "$TMP/$slice/aimux_ffi.framework/aimux_ffi"
+  # Strip debug + local symbols; global symbols stay (force_load in
+  # aimux.podspec resolves against them).
+  strip -Sx "$TMP/$slice/aimux_ffi.framework/aimux_ffi"
+  # Fail loudly on a size regression instead of letting a fat slice slip
+  # through and blow pub.dev's 256MiB package limit again: a healthy slice
+  # is ~15-30MB; an LTO/bitcode regression lands near 128MB.
+  SLICE_BYTES=$(stat -f%z "$TMP/$slice/aimux_ffi.framework/aimux_ffi")
+  if [ "$SLICE_BYTES" -gt 67108864 ]; then
+    echo "slice $triple is $SLICE_BYTES bytes (> 64MiB) — bitcode/LTO regression?" >&2
+    exit 1
+  fi
   cat > "$TMP/$slice/aimux_ffi.framework/Info.plist" <<EOF
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
@@ -39,7 +57,7 @@ for triple in aarch64-apple-ios aarch64-apple-ios-sim; do
   <key>CFBundleInfoDictionaryVersion</key><string>6.0</string>
   <key>CFBundleName</key><string>aimux_ffi</string>
   <key>CFBundlePackageType</key><string>FMWK</string>
-  <key>CFBundleShortVersionString</key><string>0.2.0</string>
+  <key>CFBundleShortVersionString</key><string>$VERSION</string>
   <key>CFBundleVersion</key><string>1</string>
 </dict></plist>
 EOF