feat(compile+runtime): binary-size work — workspace override, nativeLibrary feature forwarding, panic=abort prebuilt, native-module vtable

[proggeramlug]

Context

A 2D game (Bloom Jump) was shipping a 26MB macOS binary. Attribution showed two independent causes: (1) npm-installed perry never finds the workspace source, so auto-optimize silently links the prebuilt full stdlib — sqlite, aws-lc (incl. ML-DSA), tokio/hyper/rustls, ethers — into every binary (~8MB; even hello-world is 7.5MB); (2) no way to pass cargo features to perry.nativeLibrary crates, so engines can't offer lean build profiles. This PR fixes both and lays the substrate for making the runtime's dispatch machinery linker-strippable.

Commit 1 — compile driver + packaging

• PERRY_WORKSPACE_ROOT env override in find_perry_workspace_root (resolve.rs). npm/homebrew installs place the binary outside the workspace; neither the exe walk nor the cwd walk can ever find the source tree. Validated, with a warning when it doesn't look like a workspace.
• Fallback is no longer silent (optimized_libs.rs): linking the prebuilt full stdlib now prints a one-line note explaining the size impact and the fix.
• [native-library."<pkg>"] feature forwarding (link/native_features.rs, new + hookup in link/mod.rs): perry.toml can now declare features / default-features per nativeLibrary package, mapped onto cargo --features / --no-default-features. Longest-key match for module specs, 3 unit tests. First consumer: feat(en-014): feature-gate models3d + image-extras for pure-2D games Bloom-Engine/engine#64 (2D games drop Jolt/glTF/non-PNG codecs).
• Prebuilt panic=abort runtime variant (release-packages.yml, stage-npm.sh, library_search.rs): out-of-tree installs can't rebuild the runtime, so ship the abort profile and select it in the no-workspace fallback for runtime-only apps with no catch_unwind callers. Unix-only (Windows always links the unwind stdlib). Verified in a simulated npm layout: hello-world 8.9MB → 7.7MB (13.5%, in the documented 12-18% band).

Commit 2 — native-module vtable (runtime)

dispatch_native_module_method is a 643-arm match over (module, method) strings — one statically-reachable symbol that pins every module implementation, -dead_strip notwithstanding. Same for the own-field/Object.keys/has-in tables reachable from generic object paths.

This commit routes all of it through a NativeModuleVtable installed by the only paths that can mint native-module-backed values: js_create_native_module_namespace, the NativeModuleRef fast path, bound_native_callable_export_value, and the node_v8/perf_hooks NATIVE_MODULE_CLASS_ID allocators. Null vtable ⇒ no such value exists ⇒ generic paths fall through to default behavior. Two field_get_set.rs branch bodies relocated verbatim into native_module.rs impls. Cost: one relaxed atomic load + indirect call on paths that already string-match.

Known limitation (by design, documented in the commit): no size win lands yet, because populate_global_this_builtins eagerly creates console/process namespaces in every program (global_this.rs:4772), keeping the installer reachable. The follow-up that monetizes this substrate is splitting the dispatch match (and constant/keys/callable-export tables) per module, with a name→fn map referenced only by js_create_native_module_namespace and direct per-module constructors for the globalThis console/process creation — then no-stdlib programs pin only the console+process arms (est. 2-4MB strippable).

Testing

• native_features unit tests (3) pass; runtime suite at parity with origin/main (the native_module_stream combined-filter failures pre-exist upstream: 11 passed/2 failed on pristine main vs 12/1 on this branch; both pass in isolation).
• node:fs namespace dispatch round-trip (write/read/exists) through the vtable.
• Simulated npm install (binary + archives, no workspace): runtime-only link, abort variant auto-selected, binary runs.
• Bloom Jump end-to-end: 26.1MB → 17.2MB (with the engine-side feature gates), renders + audio verified.

Measured results

binary	before	after
hello-world (npm fallback)	8.9MB unwind / full stdlib at 0.5.1125	7.7MB abort, runtime-only
Bloom Jump (macOS)	26.1MB	17.2MB