init Top-level monolithic build entrypoint for Project Tick BSD/Linux `bin` ports.

Signed-off-by: Mehmet Samet Duman <yongdohyun@projecttick.org>

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+# bin
+
+Top-level monolithic build entrypoint for Project Tick BSD/Linux `bin` ports.
+
+This directory provides a `./configure && make` workflow that orchestrates all
+ported subcommands while keeping each subdirectory's own `GNUmakefile` as the
+build source of truth.
+
+## Build
+
+```sh
+./configure
+make -f GNUmakefile -j"$(nproc)" all
+```
+
+Default behavior is musl-first toolchain selection (`musl-gcc`/musl-capable
+clang candidates), with generated top-level overrides for common variables
+(`CC`, `AR`, `RANLIB`, `CPPFLAGS`, `CFLAGS`, `LDFLAGS`, etc.).
+
+## Test
+
+```sh
+make -f GNUmakefile test
+```
+
+This runs each subdirectory test target through the top-level orchestrator.
+Environment-limited tests may print `SKIP` and continue.
+
+## Outputs
+
+All generated artifacts are centralized under:
+
+```text
+build/   # object and generated intermediate files
+out/     # final binaries and test helper outputs
+```
+
+Subdirectories are prepared to use these shared roots during top-level builds.
+
+## Maintenance Targets
+
+```sh
+make -f GNUmakefile clean
+make -f GNUmakefile distclean
+make -f GNUmakefile reconfigure
+```
+
+- `clean`: removes shared `build/` and `out/`
+- `distclean`: also removes generated top-level `GNUmakefile` and `config.mk`
+- `reconfigure`: regenerates top-level build files
+
+## Notes
+
+- Subdirectory `GNUmakefile` files are not replaced; the top-level file only
+  drives and overrides invocation context.
+- `GNUmakefile` and `config.mk` are generated artifacts from `./configure`.
+- For command-specific behavior, limitations, and port notes, see each
+  subdirectory `README.md`.