fix(natives): repaired win32 build and bazel feature drift

- Synced pi-builtins bazel crate_features with cargo's resolved default
  set: bazel features are literal, so the meta-features never expanded
  and the procs/rg cluster (nohup, pgrep, pidwait, pkill, proc-match,
  ps, rg, sleep, timeout, top) was silently compiled out, leaving the
  process builtins unregistered under bazel and failing pi-shell tests.
- Repaired windows compilation of pi-builtins: cfg-gated the
  uucore::mode import in mkdir, imported std::env in sort's non-unix
  locale probe, mapped ProcInfo::pid through a closure in kill, brought
  MetadataExt into scope in wc, and replaced stat's unstable
  windows_by_handle metadata with a stable GetFileInformationByHandle
  query (volume serial, link count, file index, no-dereference aware).
- Imported HashSet for pi-shell's windows-only PATH merge.
- Added a clippy-ported bazel config + CI bucket so pi-builtins keeps
  its manifest-declared clippy allows under the bazel aspect while rustc
  warnings stay denied, and zeroed the remaining windows-target rustc
  warnings (unused params/imports in find, mv, rm, proc_match, ps).

.github/workflows/ci.yml

@@ -164,16 +164,21 @@ jobs:
          # test targets) plus the strict/default split: crates with
          # `[lints] workspace = true` get the workspace policy, the vendored
          # brush-core fork is exempt (same as run-rs-task.ts's cargo excludes).
-         # pi-builtins lands in the default-lints bucket below: it opts out of
-         # pedantic/nursery in its own manifest but is still linted.
+         # pi-builtins allows every clippy group in its own manifest (ported
+         # brush/uutils/jaq code) but is still held to zero rustc warnings;
+         # cargo honors that via `[lints]`, bazel via the clippy-ported config.
          - name: Clippy (workspace lint policy on opted-in crates)
            run: |
               bazelisk query "kind('rust_library|rust_shared_library', //crates/pi-ast/... + //crates/pi-iso/... + //crates/pi-natives/... + //crates/pi-shell/... + //crates/pi-voice/... + //crates/pi-walker/...)" \
                 | xargs bazelisk --bazelrc="${{ steps.cache.outputs.rc }}" build --config=clippy-strict --
          - name: Clippy (default lints elsewhere)
            run: |
-              bazelisk query "kind('rust_library|rust_shared_library', //crates/... - (//crates/pi-ast/... + //crates/pi-iso/... + //crates/pi-natives/... + //crates/pi-shell/... + //crates/pi-voice/... + //crates/pi-walker/...) - //crates/vendor/brush-core/...)" \
+              bazelisk query "kind('rust_library|rust_shared_library', //crates/... - (//crates/pi-ast/... + //crates/pi-iso/... + //crates/pi-natives/... + //crates/pi-shell/... + //crates/pi-voice/... + //crates/pi-walker/...) - //crates/pi-builtins/... - //crates/vendor/brush-core/...)" \
                 | xargs bazelisk --bazelrc="${{ steps.cache.outputs.rc }}" build --config=clippy --
+         - name: Clippy (manifest allows on ported pi-builtins)
+           run: |
+              bazelisk query "kind('rust_library|rust_shared_library', //crates/pi-builtins/...)" \
+                | xargs bazelisk --bazelrc="${{ steps.cache.outputs.rc }}" build --config=clippy-ported --
          - name: Rustfmt
            run: bazelisk --bazelrc="${{ steps.cache.outputs.rc }}" build --config=rustfmt //crates/...