Makefile: add install/uninstall targets (PREFIX/bin + libexec) (#167, fixes #164)

* Add make install/uninstall targets

Neither the root Makefile nor c/Makefile had an install target,
so 'build+install' never actually installed anything (fixes #164).
Adds standard PREFIX/DESTDIR/BINDIR-respecting install and uninstall
targets that place glm and coli in $(BINDIR).

* Split install: coli in bin/, engine + support files in libexec/

Addresses feedback on #164 from JustVugg and yurivict: coli goes to
$(BINDIR), glm/olmoe and their Python support modules
(resource_plan.py, doctor.py, openai_server.py, tools/) go to
$(LIBEXECDIR) (default $(PREFIX)/libexec/colibri), matching typical
Unix/FreeBSD-port conventions for a wrapper vs. its internals.

coli now resolves the engine path in this order:
  1. $COLI_ENGINE if set (explicit override)
  2. glm next to itself (run-in-place from a source checkout, unchanged)
  3. $(LIBEXECDIR)/glm (installed layout), also added to sys.path so
     the Python support modules still import correctly

Also adds a 'bench' target (builds iobench) since only cuda-bench
existed before.

Tested locally (WSL2/Ubuntu):
  - run-in-place: cd c && python3 coli info -> engine ready
  - installed:    make install PREFIX=$HOME/.local &&                    ~/.local/bin/coli info -> engine ready (found via libexec)
  - make uninstall cleans both bin/ and libexec/colibri/ fully

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all glm portable test check cuda-test clean
+.PHONY: all glm portable test check cuda-test clean install uninstall
 
-all glm portable test check cuda-test clean:
-	$(MAKE) -C c $@
+all glm portable test check cuda-test clean install uninstall:
+	$(MAKE) -C c $@

c/Makefile

@@ -71,6 +71,12 @@ EXE     =
 endif
 endif
 
+# --- install ---
+PREFIX     ?= /usr/local
+BINDIR     ?= $(PREFIX)/bin
+LIBEXECDIR ?= $(PREFIX)/libexec/colibri
+INSTALL    ?= install
+
 # CUDA=1 adds an opt-in backend for resident tensors. The default build remains
 # pure C and keeps the original zero-dependency runtime.
 #
@@ -222,7 +228,23 @@ check:
 	$(MAKE) portable
 	$(MAKE) test
 
+install: glm$(EXE) olmoe$(EXE)
+	$(INSTALL) -d $(DESTDIR)$(BINDIR)
+	$(INSTALL) -d $(DESTDIR)$(LIBEXECDIR)
+	$(INSTALL) -d $(DESTDIR)$(LIBEXECDIR)/tools
+	$(INSTALL) -m 755 coli $(DESTDIR)$(BINDIR)/coli
+	$(INSTALL) -m 755 glm$(EXE) $(DESTDIR)$(LIBEXECDIR)/glm$(EXE)
+	$(INSTALL) -m 755 olmoe$(EXE) $(DESTDIR)$(LIBEXECDIR)/olmoe$(EXE)
+	$(INSTALL) -m 644 resource_plan.py doctor.py openai_server.py $(DESTDIR)$(LIBEXECDIR)/
+	$(INSTALL) -m 644 tools/*.py $(DESTDIR)$(LIBEXECDIR)/tools/
+
+uninstall:
+	rm -f $(DESTDIR)$(BINDIR)/coli
+	rm -rf $(DESTDIR)$(LIBEXECDIR)
+
 clean:
 	$(PYTHON) tools/clean.py
 
-.PHONY: all glm cuda-test cuda-bench cuda-dll portable test-c test-python test check clean
+bench: iobench$(EXE)
+	@if [ -n "$(ARGS)" ]; then ./iobench$(EXE) $(ARGS); else echo "built iobench$(EXE) — run: ./iobench$(EXE) <file> <MB> <iters> <threads> <direct 0|1>"; fi
+.PHONY: all glm cuda-test cuda-bench cuda-dll portable test-c test-python test check clean install uninstall bench

c/coli

@@ -29,8 +29,31 @@ if sys.platform == "win32":
         except (AttributeError, OSError): pass
 
 HERE = os.path.dirname(os.path.abspath(__file__))
-TOOLS = os.path.join(HERE, "tools")
-GLM  = os.path.join(HERE, "glm" + (".exe" if sys.platform == "win32" else ""))
+
+# Run-in-place (source checkout, "cd c && ./coli ..."): the engine, the
+# support modules (resource_plan.py, doctor.py, openai_server.py) and
+# tools/ all live next to this script — unchanged from before.
+#
+# Installed layout ("make install"): this script is $(PREFIX)/bin/coli,
+# while the engine binaries and support files live in
+# $(PREFIX)/libexec/colibri, since they aren't meant to be run directly
+# by users. COLI_ENGINE overrides the engine path explicitly if neither
+# guess is right (e.g. a custom packaging layout).
+_EXE = ".exe" if sys.platform == "win32" else ""
+_LIBEXEC = os.path.join(os.path.dirname(HERE), "libexec", "colibri")
+_here_glm = os.path.join(HERE, "glm" + _EXE)
+
+if os.environ.get("COLI_ENGINE"):
+    GLM = os.environ["COLI_ENGINE"]
+    TOOLS = os.path.join(os.path.dirname(GLM), "tools")
+elif os.path.exists(_here_glm):
+    GLM = _here_glm
+    TOOLS = os.path.join(HERE, "tools")
+else:
+    GLM = os.path.join(_LIBEXEC, "glm" + _EXE)
+    TOOLS = os.path.join(_LIBEXEC, "tools")
+    sys.path.insert(0, _LIBEXEC)   # so `import resource_plan`, `doctor`, `openai_server` still resolve
+
 DEF_MODEL = os.environ.get("COLI_MODEL", "/home/vincenzo/glm52_i4")
 END   = b"\x01\x01END\x01\x01\n"
 READY = b"\x01\x01READY\x01\x01\n"
@@ -302,6 +325,9 @@ def stream_turn(p, sentinel, on_bytes):
 # ---------- comandi ----------
 def cmd_build(a):
     banner("build")
+    if not os.path.exists(os.path.join(HERE, "Makefile")):
+        sys.exit(f"{C.yel}coli build{C.r} only works from a source checkout (this is an installed copy).\n"
+                  f"  Clone https://github.com/JustVugg/colibri and run ./setup.sh, or make -C c glm.")
     sys.exit(subprocess.call(["make","-C",HERE,"glm"]))
 
 def cmd_info(a):