sqlite is part of the program: #import c unit replaces the Makefile cc build

src/db/sqlite.sx declares the vendored amalgamation as a named
'#import c' unit (pinned defines + -O2 + #source); every #foreign
binding resolves against it with UNPREFIXED sqlite3_* names. sx
compiles the unit through its content-addressed object cache — once
per checkout — links the objects into 'sx build' binaries, and loads
them as a priority symbol target under 'sx run', so the OS libsqlite3
can never shadow the vendored copy (the version pin in sqlite_smoke
proves it).

Retired: the Makefile vendor targets (cc -> .a + jit/.dylib), the
GENERATED dist_sqlite3_* rename.h (the JIT no longer resolves
program-owned symbols through the process images, so the rename's
reason is gone), and the -L plumbing in make build + tests/run.sh.
make test 22/22; otool -L build/dist carries no libsqlite3.

Makefile

@@ -9,48 +9,23 @@ BUILD_DIR := build
 # Programs compiled by `make build`: the smoke program and the `dist`
 # product entry point. Further entry points under src/ get added here as
 # they land.
+#
+# The vendored SQLite (vendor/sqlite/) is part of the PROGRAM, not the
+# build system: src/db/sqlite.sx declares it as a named `#import c` unit
+# (pinned defines + -O2 + #source), so sx compiles and links it through
+# its content-addressed object cache (.sx-cache/) — once per checkout.
+# `sx build` links the unit's objects into the binary; `sx run` loads
+# them as a priority symbol target the OS libsqlite3 cannot shadow.
 SMOKE := tests/smoke.sx
 DIST  := src/dist.sx
 
-# Vendored SQLite (vendor/sqlite/README.md): one amalgamation, two build
-# products in two DIRECTORIES — the macOS linker prefers a dylib over an
-# archive in the same -L directory, and `sx build` must link the static
-# copy while `sx run` (the test runner) dlopens the dylib.
-#
-# rename.h is GENERATED from the bindings: every `dist_sqlite3_*` symbol
-# named in src/db/sqlite.sx gets a #define, so the rename list and the
-# bound surface cannot drift (see the README for why renaming exists).
-VENDOR_DIR  := $(BUILD_DIR)/vendor
-SQLITE_SRC  := vendor/sqlite/sqlite3.c
-SQLITE_DEFS := -DSQLITE_DQS=0 -DSQLITE_THREADSAFE=0 -DSQLITE_DEFAULT_MEMSTATUS=0 \
-               -DSQLITE_OMIT_DEPRECATED -DSQLITE_OMIT_SHARED_CACHE \
-               -DSQLITE_LIKE_DOESNT_MATCH_BLOBS -DSQLITE_ENABLE_COLUMN_METADATA \
-               -include $(VENDOR_DIR)/rename.h
-
-$(VENDOR_DIR)/rename.h: src/db/sqlite.sx
-	@mkdir -p $(VENDOR_DIR)
-	@{ echo '/* GENERATED by make from src/db/sqlite.sx — do not edit. */'; \
-	   grep -o '"dist_sqlite3_[a-z0-9_]*"' src/db/sqlite.sx | tr -d '"' | sort -u | \
-	   sed 's/^dist_\(.*\)/#define \1 dist_\1/'; } > $@
-
-$(VENDOR_DIR)/libsqlite3.a: $(SQLITE_SRC) vendor/sqlite/sqlite3.h $(VENDOR_DIR)/rename.h
-	@mkdir -p $(VENDOR_DIR)
-	cc $(SQLITE_DEFS) -O2 -c $(SQLITE_SRC) -o $(VENDOR_DIR)/sqlite3.o
-	ar rcs $@ $(VENDOR_DIR)/sqlite3.o
-
-$(VENDOR_DIR)/jit/libsqlite3.dylib: $(SQLITE_SRC) vendor/sqlite/sqlite3.h $(VENDOR_DIR)/rename.h
-	@mkdir -p $(VENDOR_DIR)/jit
-	cc $(SQLITE_DEFS) -O2 -dynamiclib $(SQLITE_SRC) -o $@
-
-.PHONY: build test publish-example vendor clean
-
-vendor: $(VENDOR_DIR)/libsqlite3.a $(VENDOR_DIR)/jit/libsqlite3.dylib
+.PHONY: build test publish-example clean
 
 # Compile the product sources (and the smoke program) without running.
-build: vendor
+build:
 	@mkdir -p $(BUILD_DIR)
 	$(SX) build -o $(BUILD_DIR)/smoke $(SMOKE)
-	$(SX) build -o $(BUILD_DIR)/dist $(DIST) -L $(VENDOR_DIR)
+	$(SX) build -o $(BUILD_DIR)/dist $(DIST)
 
 # Run the test runner over every tests/**/*.sx. Exits non-zero on any
 # failure. Depends on `build` so the CLI acceptance test (tests/cli_*.sx)
@@ -67,4 +42,4 @@ publish-example: build
 	./$(BUILD_DIR)/dist ci publish --manifest examples/dist.json --local-store .sx-tmp/publish-example --json
 
 clean:
-	@rm -rf $(BUILD_DIR)
+	@rm -rf $(BUILD_DIR) .sx-cache