P5.6 (macOS): default_pipeline drives bundling; fix issue 0125 (array-format blowup)

build.sx now `#import`s the sx bundler and `default_pipeline` delegates to its
`bundle_main` when a bundle was requested (emit + link, then wrap the binary into
the `.app`/`.apk`); otherwise it just emit+links via the shared `emit_and_link`
core. The Zig `--bundle`/`post_link_module` dispatch shim is removed — the CLI
bundle flags only feed `BuildConfig`, and `default_pipeline` branches on
`bundle_path()`. Validated end-to-end on macOS: `sx build --bundle App.app
--bundle-id … foo.sx` on a plain program AND auto-bundle from `set_bundle_path`
both produce a valid signed `.app` (correct `Contents/MacOS/` layout, Info.plist,
passes `codesign`, binary runs). Also fixed a pre-existing host-build bug:
target_triple was left empty for host builds → `is_macos()` false → wrong flat
layout; main.zig now exposes the host triple when `--target` is absent.

bundle_main no longer re-calls `build_options()` (the handle is already its `opts`
param).

Fix issue 0125 (root cause): the type-match dispatcher unboxed each interned array
tag to the concrete array type — a whole-array load — and passed it to
`array_to_string` by value, which LLVM scalarized into one SelectionDAG node per
element (~12s / segfault at [65536]u8). The bundler's `format("…{}…")` instantiates
`any_to_string`, so importing it into the prelude surfaced 0125 for any large-array
program. Fix (route 1): `any_to_string`'s `case array:` arm calls `slice_to_string`,
and `lowerRuntimeDispatchCall` detects an ARRAY tag bound to a SLICE param and builds
a `{ptr,len}` slice VIEW of the payload pointer (`unbox_any → [*]elem` is an
int-to-ptr with NO load, paired with the array length) instead of loading the array.
Output is byte-identical (`[a, b, c]`). Pinned as
examples/0056-basic-large-array-format-no-blowup.sx; 0055 drops 12s → 0.2s.

37 `.ir` snapshots regenerated (build.sx now pulls in the bundler's types + the
array-format lowering changed); verified `.ir`-only, zero behavior-stream diffs.
705/0 both gates.

library/modules/platform/bundle.sx

@@ -29,14 +29,18 @@
 // `abi(.compiler)` so the backend doesn't lower it and its `build_options()`
 // compiler-API call is permitted (it would otherwise be rejected as a
 // comptime-only function called at runtime).
-bundle_main :: (opt: BuildOptions) -> bool abi(.compiler) {
-    opts := build_options();
+bundle_main :: (opts: BuildOptions) -> bool abi(.compiler) {
+    // Run the standard build core first (emit the object + link the binary) — an
+    // `on_build` override REPLACES default_pipeline, so the bundler owns the whole
+    // pipeline: emit + link, then wrap the linked binary into the `.app` / `.apk`.
+    if !emit_and_link(opts) { return false; }
+
     binary := opts.binary_path();
     bundle := opts.bundle_path();
     bid    := opts.bundle_id();
 
     if bundle.len == 0 {
-        // No bundle requested — nothing to do. Build succeeded.
+        // No bundle requested — emit+link already done. Build succeeded.
         return true;
     }
     if bid.len == 0 {