fix(ci): repair aspect_tests.sh grep-count bash bug (baseline rot)

`Aspect — Thread Safety + ABI Contract + SPDX` has been red on `main`,
gating every PR on these lines:

  tests/aspect_tests.sh: line 77: [[: 0
  0: syntax error in expression (error token is "0")

Root cause: `grep -c 'pattern' file 2>/dev/null || echo "0"`.  When
`grep -c` finds zero matches it outputs `0` to stdout **and** exits
non-zero, which then triggers `|| echo "0"` — `has_export` ends up
`"0\n0"`, and `[[ "0\n0" -gt 0 ]]` chokes on the embedded newline in
arithmetic context.  Swapped the `|| echo "0"` for `|| true` on all
four call-sites; `grep -c` already prints `0` cleanly, the `|| true`
just suppresses the exit code for `set -euo pipefail`.

Verification: `bash -n tests/aspect_tests.sh` clean.

(The companion `.github/workflows/e2e.yml` fix — Zig 0.15.0 → 0.15.1
and the `denoland/setup-deno` SHA refresh — is held out because the
current OAuth token lacks the `workflow` scope GitHub requires for
workflow-file edits.  Will land separately once the token is rotated
or via a token with the right scope.)

Out of scope and deliberately not touched:
  - `governance / Language / package anti-pattern policy` — also red
    on main, but a parallel session is already diagnosing it under the
    Estate-drift-remediation 2026-05 campaign (parent standards#66).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

tests/aspect_tests.sh

@@ -71,8 +71,8 @@ for zigfile in "$zig_ffi_dir"/*.zig; do
             ;;
     esac
 
-    has_export=$(grep -cP '(?:pub )?export fn' "$zigfile" 2>/dev/null || echo "0")
-    has_mutex=$(grep -c 'Mutex' "$zigfile" 2>/dev/null || echo "0")
+    has_export=$(grep -cP '(?:pub )?export fn' "$zigfile" 2>/dev/null || true)
+    has_mutex=$(grep -c 'Mutex' "$zigfile" 2>/dev/null || true)
 
     if [[ "$has_export" -gt 0 && "$has_mutex" -eq 0 ]]; then
         fail "$basename_zig has $has_export C-ABI exports but no Mutex"
@@ -95,8 +95,8 @@ for cart_dir in "$PROJECT_DIR"/cartridges/*/ffi; do
     fi
 
     if [[ -n "$ffi_zig" ]]; then
-        has_export=$(grep -c 'pub export fn' "$ffi_zig" 2>/dev/null || echo "0")
-        has_mutex=$(grep -c 'Mutex' "$ffi_zig" 2>/dev/null || echo "0")
+        has_export=$(grep -c 'pub export fn' "$ffi_zig" 2>/dev/null || true)
+        has_mutex=$(grep -c 'Mutex' "$ffi_zig" 2>/dev/null || true)
 
         if [[ "$has_export" -gt 0 && "$has_mutex" -eq 0 ]]; then
             fail "$cart_name FFI: $has_export exports, no Mutex"