diff --git a/Makefile b/Makefile
index d7057fa3..87b56360 100644
--- a/Makefile
+++ b/Makefile
@@ -641,7 +641,7 @@ test-library: $(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 	@echo "ww test -j $(JOBS) lib/..."
 	@mkdir -p $(WWBUILD)/wwtest-lib
 	@$(CURDIR)/$(BIN)/ww test -j $(JOBS) -w $(WWBUILD)/wwtest-lib \
-		-I $(CURDIR)/lib/ww lib/...
+		lib/...
 
 test-bootstrap-native: $(WRAPPER_TOOLS) $(BOOTSTRAP_WRAPPER_BINS)
 	@set -e; for t in $(BOOTSTRAP_WRAPPER_BINS); do \
diff --git a/docs/test-system-v2.md b/docs/test-system-v2.md
index 4f56b9fa..8bb32109 100644
--- a/docs/test-system-v2.md
+++ b/docs/test-system-v2.md
@@ -26,7 +26,7 @@ categories out of the ordinary developer target.
 | Compile success/rejection, stage-routed diagnostics, and runtime exit | `test/wcc/data/*/case.ww`, executed by `wwfixture` |
 | Package semantics | `test/package` and the native package-test coordinator |
 | Language behavior | `test/lang/*_test.ww` through the language `@test` runtime |
-| Library behavior | The package coordinator's `lib/...` tree walk (`ww test -j N -I lib/ww lib/...`) |
+| Library behavior | The package coordinator's `lib/...` tree walk (`ww test -j N lib/...`) |
 | Standalone library-source compilation | Four real source paths named by `LIBRARY_STANDALONE_SOURCES`, compiled directly by both frontends |
 | Compiler-output identity | `test-lang-byteid` and `test-data-byteid` plus residual byte/artifact carriers |
 | Fixed point and self-host | `test-bootstrap` |
@@ -192,25 +192,30 @@ and nonempty-version-constant assertions.
 ## Package and language behavior
 
 `ww test` delegates directory package requests to the native package
-coordinator. The coordinator owns discovery, package grouping, same-package and
-external-package test composition, filtering, result aggregation, and its
-internal temporary workspace. Test sources are exclusively `*_test.ww` (Go's
-`_test.go` contract): a line-leading `@test` declaration in any other source is
-rejected loudly — by both driver stages at directory enumeration and by the
-coordinator at source classification. A trailing `...` path element (`ww test lib/...`,
-Go's `./...` form) is recognized by both driver stages before path resolution
-and walks the tree rooted at the prefix: every subdirectory whose name does not
-begin with `.` or `_` is descended with the same lstat/no-symlink discipline,
-each test-bearing directory becomes one package run, and source-bearing
-directories without tests report the usual `?` line. The coordinator's
-`-j N` schedules up to N package groups concurrently (build-then-run
-process chains supervised with `os.exec` start/poll, no threads);
-emission stays strictly in group order, so the byte stream is identical
-at every `-j` level, and `-j 1` — the default — matches the former
-sequential loop exactly. Measured on the 31-package `lib/...` walk:
+coordinator. The coordinator owns request-pattern expansion, package grouping,
+same-package and external-package variant selection, filtering, result
+aggregation, and its internal temporary workspace. Test sources are exclusively
+`*_test.ww` (Go's `_test.go` contract): a line-leading `@test` declaration in
+any other source is rejected loudly — by both driver stages at directory
+enumeration and by the coordinator at source classification. A local spelling
+containing `...` (for example `ww test lib/...`, Go's `./...` form) is
+recognized by both driver stages before path resolution and walks from the
+directory prefix before the first wildcard. Recursive children beginning `.`
+or `_` and exact `testdata` subtrees are pruned; child directory symlinks are
+not followed. A wildcard cannot consume a non-terminal exact `vendor` element,
+while an explicitly vendor-rooted pattern remains legal. Every selected
+test-bearing directory becomes one package run, and selected source-bearing
+directories without tests report the usual `?` line. The coordinator first
+launches one driver plan for the complete command-global package/action union.
+After that shared build completes, `-j N` schedules up to N successful selected
+test binaries concurrently under `os.exec` start/poll supervision (no threads);
+emission stays strictly in group order, so the byte stream is identical at
+every `-j` level, and `-j 1` — the default — matches the former sequential
+run loop exactly. Measured on the 31-package `lib/...` walk:
 7.0s sequential, 2.4s at `-j 4`. With `-c`, it publishes each exact
-`<package>.test` binary and adjacent `<package>.test.sepwork` tree in the
-package directory; those become caller-owned artifacts. `-c -o <name>`
+`<package>.test` binary in the package directory; the first output owns the one
+shared cold sepwork containing the command-global action universe. Those become
+caller-owned artifacts. `-c -o <name>`
 names that artifact instead of the fixed stem, for exactly one package:
 the coordinator rejects a multi-package fan-out ("cannot use -o with
 multiple packages", Go's `go test -o` rule), and `-o` without `-c` is
@@ -234,10 +239,11 @@ and make cleanup failure fail the command. Make recipes build driver-produced
 tools in invocation-owned directories and apply the same exact cleanup rule.
 
 `ww build -w DIR` and single-file `ww test -w DIR` replace that scratch with a
-caller-owned persistent package-artifact workdir: the directory must already
-exist, is never cleaned by the driver, and holds one committed unit, `.wwi`,
-`.s`, `.o`, and dep `.a` per package plus byte copies of the invoking driver,
-compiler, and assembler and a small mode stamp. A package is reused only when
+caller-owned persistent package-artifact workdir: for these direct routes the
+directory must already exist, is never cleaned by the driver, and holds one
+committed unit, `.wwi`, `.s`, `.o`, and dep `.a` per package plus byte copies of
+the invoking driver, compiler, and assembler and a small mode stamp. A package
+is reused only when
 its freshly composed owner unit byte-equals the committed unit, no recompiled
 direct dependency emitted changed export bytes, and every applicable recorded
 executable byte-equals the live executable — content identity only, no mtimes,
@@ -248,19 +254,23 @@ that neither unit bytes nor compiler identity can name.
 Recompiled artifacts land at staged `.new` names and commit by rename with the
 unit renamed last, so an interrupted build forces a recompile rather than a
 false reuse; the link always reruns. One workdir serves one invocation at a
-time and one (root, mode) shape; both driver stages implement the identical
-contract. This is build staleness in the Make/mk/Go sense, not a result cache:
+time and may hold the complete command-global action universe for all selected
+roots and isolated variants; semantic identity, rather than request shape,
+controls reuse. Both driver stages implement the identical contract. This is
+build staleness in the Make/mk/Go sense, not a result cache:
 tests always run, and the byte-identity and bootstrap gates keep building on
 fresh scratch. `make clean` reclaims every workdir under `out/`.
 
-On a package or tree target, `ww test -w DIR` forwards to the coordinator,
-which keys one persistent driver workdir per package group under `DIR`
-(`<dir>_<pkg>` with `/` flattened) and passes it to each inner build; every
-reuse decision stays with the driver's content-identity contract above.
-`-w` and `-c` do not mix there — the coordinator rejects the combination
-rather than guess which artifact tree the caller owns. `test-library` uses
-exactly this: one `ww test -j $(JOBS) -w out/wwbuild/wwtest-lib -I lib/ww
-lib/...` line owns library behavior (measured: 2.3s cold, 1.0s warm at
+On a package or tree target, `ww build/test -w DIR` forwards that exact caller
+path as the one command-global semantic-action store; neither pattern spelling
+nor package-group name derives a persistent subdirectory. The delegated driver
+may create a missing store only after graph and request preflight, and rolls
+back newly created empty prefixes if later setup fails. Every reuse decision
+stays with the driver's content-identity contract above. `-w` and test `-c` do
+not mix — the coordinator rejects the combination rather than guess which
+artifact tree the caller owns. `test-library` uses exactly this: one
+`ww test -j $(JOBS) -w out/wwbuild/wwtest-lib lib/...` line owns library
+behavior (measured: 2.3s cold, 1.0s warm at
 `-j 4`, vs 4.7s for the retired 59-target per-file fan-out).
 
 `test/lang` currently uses one package per source file, so its complete gate
diff --git a/test/tool/driver_test.ww b/test/tool/driver_test.ww
index b6a70fe5..bfdb6647 100644
--- a/test/tool/driver_test.ww
+++ b/test/tool/driver_test.ww
@@ -1,18 +1,18 @@
 package driver_test;
 
 // `ww` driver CLI observers. Ports of the retired native carriers
-// test/wcc/949_driver_flagargs.c and 949_missingpkg.c; every
-// assertion preserved.
+// test/wcc/949_driver_flagargs.c and 949_missingpkg.c; the retired
+// second-positional single-file-only assertion now belongs to package-root
+// selection, while the remaining driver assertions stay here.
 //
 // flagargs (#15 B2) — `ww -V` exits 0 with stdout exactly
-// "ww <WW_VERSION>\n" and empty stderr; 15 flag-misuse rows each exit
+// "ww <WW_VERSION>\n" and empty stderr; 14 flag-misuse rows each exit
 // 2 with the row's stderr fragment; and on every row plus -V the
 // wwstage twin `ww_ww` matches the cstage `ww` byte-exactly on exit
 // code, stdout and stderr (rule 10 on the driver surface). The
 // version oracle is parsed from cmd/wcc/ww.h at run time, preserving
 // the carrier's exact-output ownership without a C toolchain
-// dependency. Rows run from a fresh scratch cwd: the `test . zzz` row
-// takes `.` positionally, so the cwd must never be the repo tree.
+// dependency.
 //
 // missingpkg (#16 ENFORCE-driver) — `ww build` over a source whose
 // only import cannot be located exits nonzero with "cannot find
@@ -168,13 +168,13 @@ fn runrootargv(dir: str, root: str, name: str, drv: str,
 @test fn flagargs() void = {
 	let a1: []str = ["build", "build", "build", "build", "build",
 		"run", "run", "run", "test", "test", "test", "test", "test",
-		"test", "test"];
+		"test"];
 	let a2: []str = ["-o", "-I", "-L", "-l", "-zz",
 		"-o", "-l", "-zz", "-l", "-zz", "-I", "-o", "-o",
-		"-run", "."];
+		"-run"];
 	let a3: []str = ["", "", "", "", "",
 		"", "", "", "", "", "", "", "x",
-		"", "zzz"];
+		""];
 	let subs: []str = [
 		"ww build: -o needs an argument",
 		"ww build: -I needs an argument",
@@ -189,8 +189,7 @@ fn runrootargv(dir: str, root: str, name: str, drv: str,
 		"ww test: -I needs an argument",
 		"ww test: -o needs an argument",
 		"ww test: -o needs -c for a package target",
-		"ww test: -run needs an argument",
-		"ww test: pattern needs a single test file"];
+		"ww test: -run needs an argument"];
 	let i: i32 = 0;
 	for (i < subs.len) {
 		let td: str = testenv.fresh();
@@ -231,8 +230,8 @@ fn runrootargv(dir: str, root: str, name: str, drv: str,
 	// -o needs a writable stem: the output-derived .sepwork follows -o,
 	// so /dev/null would yield an uncreatable /dev/null.sepwork and
 	// mask the missing-package fatal.
-	let av: []str = [testenv.driver("ww"), "build", src, "-o",
-		strings.concat(td, "/miss.out")];
+	let av: []str = [testenv.driver("ww"), "build", "-o",
+		strings.concat(td, "/miss.out"), src];
 	testenv.runcommand(td, td, "miss", av, tmo(), &co);
 	assert(co.termination == exec.termination.EXIT);
 	if (co.code == 0) {
diff --git a/test/wcc/810_dyn.c b/test/wcc/810_dyn.c
index 9bfc6a49..880c1108 100644
--- a/test/wcc/810_dyn.c
+++ b/test/wcc/810_dyn.c
@@ -152,8 +152,8 @@ main(void)
 
 		char cmd[1024];
 		snprintf(cmd, sizeof cmd,
-		    "%s/ww build -o %s %s -L %s -l c",
-		    bin, outbin, src, libdir);
+		    "%s/ww build -o %s -L %s -l c %s",
+		    bin, outbin, libdir, src);
 		if (runwait(cmd) != 0) {
 			fprintf(stderr, "dyn row %d: build failed\n", i);
 			rowfail = 1;
diff --git a/test/wcc/989_dynentry_run.c b/test/wcc/989_dynentry_run.c
index 8fa6a092..4138ef80 100644
--- a/test/wcc/989_dynentry_run.c
+++ b/test/wcc/989_dynentry_run.c
@@ -72,8 +72,8 @@ build_run(const char *driver, const char *src, const char *libdir,
 {
 	char cmd[1024];
 	snprintf(outbin, obsz, "%s/main", tmpdir);
-	snprintf(cmd, sizeof cmd, "cd %s && %s build -o %s %s -L %s -l c "
-	    "2>/dev/null", tmpdir, driver, outbin, src, libdir);
+	snprintf(cmd, sizeof cmd, "cd %s && %s build -o %s -L %s -l c %s "
+	    "2>/dev/null", tmpdir, driver, outbin, libdir, src);
 	if (runwait(cmd) != 0) return -1;
 	return runwait(outbin);
 }
diff --git a/test/wcc/996_dyn_ww.c b/test/wcc/996_dyn_ww.c
index 076379d8..2cd995b9 100644
--- a/test/wcc/996_dyn_ww.c
+++ b/test/wcc/996_dyn_ww.c
@@ -114,8 +114,8 @@ main(void)
 	}
 
 	snprintf(cmd, sizeof cmd,
-	    "%s/ww build -o %s %s -L %s -l c >/dev/null 2>&1",
-	    bin, stem, src, libdir);
+	    "%s/ww build -o %s -L %s -l c %s >/dev/null 2>&1",
+	    bin, stem, libdir, src);
 	if (runwait(cmd) != 0) {
 		fprintf(stderr, "w6l_ww-dyn FAIL: cannot build generated command\n");
 		rc = 1;