fix(portability): make test green on macOS, GNU-only idioms replaced

The suite and seven libs assumed a GNU userland: `cmd | grep -q` under
pipefail (grep exits at the first match, the producer takes SIGPIPE,
rc 141 → 15 false "merged into" FAILs in gitflow-test), `sed -i` with no
suffix, `wc -l` padding compared as a string, `stat -c`, `touch -d`,
`realpath -m` (gstack-links refusal never fired), bare `timeout` off the
sanitized PATH (design gate READY BUT UNVERIFIED), `grep -oP` (update-all
emptied the plugin list). Thirteen suites were red on this machine.

Portable forms on the native userland of both OS: producer captured out
of the pipeline, `sed -i.bak` in tests and a temp-sibling `sed_profile`
on the user dotfile, `tr -d ' '`, python3 perms, `touch -t`, a
`realpath -m` emulation that refuses `..`, perl `alarm` for the 15 s
bound, `sed -n` token extraction. Regression tests: gstack-links T4b,
doctrine-citers Alphabet/Alpha flip, profile-set-managed T18 (failing CLI
no longer aborts `set`), new portability-census suite over the tracked
shell files. Linux run deferred (see TODO).

lib/tests/source-scope.test.sh

@@ -45,8 +45,8 @@ case "$G" in *"*"*) check C2-grep-has-no-glob "has-glob" ok ;;
   *) check C2-grep-has-no-glob ok ok ;; esac
 
 # --- findargs: one token per line, 3 tokens per dir ---
-N="$(cd "$TMP/plain" && bash "$S" findargs | wc -l)"
-D="$(cd "$TMP/plain" && bash "$S" list | wc -l)"
+N="$(cd "$TMP/plain" && bash "$S" findargs | wc -l | tr -d ' ')"
+D="$(cd "$TMP/plain" && bash "$S" list | wc -l | tr -d ' ')"
 check D1-findargs-3-tokens-per-dir "$N" "$((D * 3))"
 check D2-findargs-first-token "$(cd "$TMP/plain" && bash "$S" findargs | head -1)" '!'
 
@@ -63,7 +63,7 @@ check E1-excludes-dist  "$(find . "${FEXCL[@]}" -name 'a.png' | grep -c '/dist/'
 check E2-keeps-src      "$(find . "${FEXCL[@]}" -name 'a.png' | grep -c '/src/')"   1
 check E3-excludes-nodem "$(find . "${FEXCL[@]}" -name '*.png' | grep -c 'node_modules')" 0
 # public/ survives: the audit's own resource checks live there
-check E4-keeps-public   "$(find . "${FEXCL[@]}" -name 'favicon.ico' | wc -l)" 1
+check E4-keeps-public   "$(find . "${FEXCL[@]}" -name 'favicon.ico' | wc -l | tr -d ' ')" 1
 cd / || exit 1
 
 # --- usage ---