checkpoint: P5.6 macOS bundling via default_pipeline + 0125 fix done; remaining iOS/Android validation

current/CHECKPOINT-COMPILER-API.md

@@ -431,6 +431,29 @@ when reached (sentinels or accessor fns; see the design doc Risks).
   `List` growth; orthogonal, see `current/CHECKPOINT-METATYPE.md`.)
 
 ## Log
+- **P5.6 (macOS path) — `default_pipeline` drives bundling; fix issue 0125 (2026-06-19).** `build.sx` now
+  `#import`s `platform/bundle.sx` and `default_pipeline` delegates to `bundle_main` when `bundle_path()` is set
+  (emit+link via the shared `emit_and_link` core, then wrap the `.app`/`.apk`); else just emit+link. **Removed the
+  Zig `--bundle`/`post_link_module` dispatch shim** (main.zig) — CLI bundle flags only feed `BuildConfig`,
+  `default_pipeline` branches on `bundle_path()`. **USER DECISION:** import the bundler directly (it's
+  `abi(.compiler)`, emit-skipped, never in the binary; the build↔bundle import cycle resolves like std↔build) —
+  NOT a registration slot. **Validated end-to-end on macOS** (the stream's top-risk gap — bundler had ZERO
+  coverage): `sx build --bundle App.app --bundle-id … plain.sx` AND auto-bundle from `set_bundle_path` both produce
+  a valid SIGNED `.app` (correct `Contents/MacOS/` layout, Info.plist, passes `codesign`, binary runs). Fixed a
+  pre-existing host-build bug: `target_triple` was empty for host builds → `is_macos()` false → wrong flat layout;
+  main.zig now exposes the host triple (`LLVMGetDefaultTargetTriple`) when `--target` is absent. `bundle_main`
+  dropped its redundant `build_options()` re-fetch (uses its `opts` param). **Fix issue 0125** (surfaced because
+  the bundler's `format("…{}…")` instantiates `any_to_string`, which over-materialized array types): the type-match
+  dispatcher (`lowerRuntimeDispatchCall`) unboxed each interned array tag to the concrete array type (whole-array
+  load) → LLVM scalarized to one DAG node/element (~12s / segfault at `[65536]u8`). Fix (route 1): `case array:`
+  arm calls `slice_to_string`, dispatcher builds a `{ptr,len}` slice VIEW of the payload pointer (`unbox_any →
+  [*]elem` = int-to-ptr, NO load) for an ARRAY tag bound to a SLICE param. Output byte-identical (`[a, b, c]`);
+  0055 drops 12s→0.2s. Pinned `examples/0056-basic-large-array-format-no-blowup.sx`; issue 0125 marked RESOLVED.
+  37 `.ir` regenerated (bundler types + array-format lowering); `.ir`-only. **705/0 both gates** (`48eb7bf`).
+  > **REMAINING P5.6 / next:** iOS-device / iOS-sim / Android paths in `bundle_main` exist + now run on the VM (the
+  > `shr` port let them through) but are NOT validated on this host (no iOS/Android SDK + no corpus bundle harness)
+  > — that's P5.8 (build `m3te`/`distribution` end-to-end + add `.app`/`.apk` corpus smoke tests). Then P5.7 (delete
+  > `#compiler`/`compiler_call`/`compiler_hooks`/`interp.zig` + the legacy fallback; VM becomes the sole evaluator).
 - **P5.6 prerequisite — bitwise/shift ops ported into the VM (2026-06-19).** `comptime_vm` exec now handles
   `bit_and`/`bit_or`/`bit_xor`/`bit_not`/`shl`/`shr` (new `bitwise` helper next to `arith`), mirroring the legacy
   interp's i64 model EXACTLY: shift amount clamps to `@min(rhs, 63)`, `shr` is an ARITHMETIC right shift