refactor(wpt): move streams submodule under test/fixtures/wpt/

Co-locates the sparse WPT submodule with its harness.mjs + run-file.mjs fixtures under packages/node-smol-builder/test/fixtures/wpt/. Old path under scripts/vendor-fast-webstreams/ was misleading once the runner became a test fixture — wpt belongs under test/. Updates .gitmodules path, .gitignore comment block, .config/lockstep.json submodule pointer. .git/modules dir moved + the worktree .git pointer file updated so git submodule status still reports the gitlink cleanly.

Author: jdalton

.config/lockstep.json

@@ -36,7 +36,7 @@
       "repo": "https://github.com/Mbed-TLS/mbedtls"
     },
     "wpt": {
-      "submodule": "packages/node-smol-builder/scripts/vendor-fast-webstreams/wpt/streams",
+      "submodule": "packages/node-smol-builder/test/fixtures/wpt/streams",
       "repo": "https://github.com/web-platform-tests/wpt"
     },
     "liburing": {

.gitignore

@@ -62,13 +62,11 @@ packages/node-smol-builder/additions/source-patched/include/temporal_rs/
 # Vendored npm packages (sync-time generated from node_modules).
 packages/node-smol-builder/additions/source-patched/deps/fast-webstreams/
 
-# WPT streams tests — managed as a sparse-checkout submodule
-# (scripts/git-partial-submodule.mts reads sparse-checkout = streams/
-# from .gitmodules). The streams/ working tree is tracked through the
-# submodule machinery, not ignored. The .wpt-tmp/ scratch dir is still
-# ignored because the legacy rsync flow may write transient state
-# there during validate.mts runs.
-packages/node-smol-builder/scripts/vendor-fast-webstreams/wpt/.wpt-tmp/
+# WPT streams tests — managed as a sparse-checkout submodule at
+# packages/node-smol-builder/test/fixtures/wpt/streams.
+# scripts/git-partial-submodule.mts reads sparse-checkout = streams/
+# from .gitmodules. The streams/ working tree is tracked through the
+# submodule machinery, not ignored.
 packages/node-smol-builder/additions/source-patched/deps/lzfse/src/
 packages/node-smol-builder/additions/source-patched/deps/libdeflate/*
 !packages/node-smol-builder/additions/source-patched/deps/libdeflate/libdeflate.gyp

.gitmodules

@@ -48,7 +48,7 @@
 	shallow = true
 # wpt-epochs/three_hourly/2026-02-24_21H
 [submodule "packages/node-smol-builder/scripts/vendor-fast-webstreams/wpt/streams"]
-	path = packages/node-smol-builder/scripts/vendor-fast-webstreams/wpt/streams
+	path = packages/node-smol-builder/test/fixtures/wpt/streams
 	url = https://github.com/web-platform-tests/wpt.git
 	ignore = dirty
 	shallow = true