seam-probe

# seam-probe `seam-probe` is a **generic** NDJSON probe for embedded-runtime seams. It ships **zero** app-specific knowledge. Everything app-specific is expressed in a small JSON **manifest** that the user (or you) writes and hands to the binary. There are two real seams in this skill's world: | Seam | What it is | Probe mode | | --------------- | ----------------------------------------------------- | --------------- | | FFI dylib | dlopen + extern "C" entry points + callback struct | `seam-probe ffi` | | UDS endpoint | Unix-domain socket carrying length-prefixed frames | `seam-probe socket` | Plus two utility modes that need no manifest: | Utility | What it does | | ---------------- | ----------------------------------------------------- | | `inspect` | Dump exported symbols of a dylib (Mach-O / ELF / PE) | | `vocab` | Print the stdin/stdout NDJSON contract verbatim | ### Scope: what counts as a "seam" The probe handles **dynamically-loaded native code** (FFI mode) and **Unix-domain sockets carrying byte frames** (socket mode). Concretely in scope: - `.dylib` (Mach-O), `.so` (ELF), `.dll` (PE) loaded via `dlopen` / `LoadLibrary`. The library must export an `extern "C"` lifecycle function and accept a plain C-ABI callback struct. - Unix-domain stream sockets with `be32` / `be64` / `varint` framing, or no framing at a...