fix(newos4): refuse shell composition, wc takes multiple paths (v4.6.58)

Packet 1 and 3 (silent wrong answers from a shell-less terminal).

- detectComposition() in the security gate refuses ; && || | before dispatch.
  `;` used to fail loudly, but `&&`/`||` folded the right-hand side into the left
  command's argv (wc -l f && grep -c x f returned "42 42"), and a `|` arriving from
  the AI run_command tool bypassed splitPipe entirely and degraded the pattern to
  empty -- which matches every line. Operators inside quotes are untouched.
- wc accepts multiple paths: one line per file plus a total, per-file errors for
  missing paths. `wc -c a b` used to print only `a` and exit 0.
- help.html: "There is no shell" callout at the top of the command reference,
  plus the v4.6.57/58 changelog entry.

Verified live on v4.6.58 by replaying the exact call sequence used by both paths:
interactive `wc -c a b` -> "14 a / 10 b / 24 total"; `&&` and `;` refused;
`echo "a && b"` still echoes; AI run_command semantics with `|` and `&&` refused;
single command and multi-file wc still return real output.

1 files changed, 34 insertions, 14 deletions

diff --git a/modules/core/module-fs.js b/modules/core/module-fs.js
index 03c3733..f93553a 100644
--- a/modules/core/module-fs.js
+++ b/modules/core/module-fs.js
@@ -438,26 +438,46 @@ class FileSystemModule {
         this.commands['wc'] = (args) => {
             // 2026-10-21: accept -l / -w / -c (previously ANY flag was read as a filename,
             // so `wc -l file` answered "wc: -l: No such file").
+            // v4.6.58: multiple files. `wc -c a b` used to print only `a` and exit clean —
+            // a silent false negative (packet §1).
             const want = { l: false, w: false, c: false };
-            let file = null;
+            const files = [];
             (args || []).forEach(a => {
                 if (/^-[lwc]+$/.test(a)) a.slice(1).split('').forEach(k => { want[k] = true; });
                 else if (/^-[a-zA-Z]+$/.test(a)) { /* ignore other flags */ }
-                else if (!file) file = a;
+                else files.push(a);
             });
-            if (!file) return this.terminal.print('Usage: wc [-l] [-w] [-c] <filename>', 'warning');
-            const content = this.terminal.fs.readFile(file);
-            if (content === null || content === undefined) return this.terminal.print('wc: ' + file + ': No such file', 'error');
-            const lines = content.split('\n').length;
-            const words = content.split(/\s+/).filter(w => w).length;
-            const chars = content.length;
+            if (!files.length) return this.terminal.print('Usage: wc [-l] [-w] [-c] <filename> [...]', 'warning');
             const anyFlag = want.l || want.w || want.c;
-            const out = [];
-            if (want.l || !anyFlag) out.push(lines);
-            if (want.w || !anyFlag) out.push(words);
-            if (want.c || !anyFlag) out.push(chars);
-            if (anyFlag && !(want.l && want.w && want.c)) out.push(file);
-            this.terminal.print(out.join(' '));
+            const rows = [];
+            let total = { l: 0, w: 0, c: 0 };
+            files.forEach(file => {
+                const content = this.terminal.fs.readFile(file);
+                if (content === null || content === undefined) {
+                    this.terminal.print('wc: ' + file + ': No such file', 'error');
+                    return;
+                }
+                const r = {
+                    file: file,
+                    l: content.split('\n').length,
+                    w: content.split(/\s+/).filter(w => w).length,
+                    c: content.length
+                };
+                total.l += r.l; total.w += r.w; total.c += r.c;
+                rows.push(r);
+            });
+            if (!rows.length) return;
+            const multi = rows.length > 1;
+            const fmt = (r, name) => {
+                const out = [];
+                if (want.l || !anyFlag) out.push(r.l);
+                if (want.w || !anyFlag) out.push(r.w);
+                if (want.c || !anyFlag) out.push(r.c);
+                if (multi || (anyFlag && !(want.l && want.w && want.c))) out.push(name);
+                return out.join(' ');
+            };
+            rows.forEach(r => this.terminal.print(fmt(r, r.file)));
+            if (multi) this.terminal.print(fmt(total, 'total'));
         };
         this.commands['touch'] = (args) => {
             if(!args[0]) return this.terminal.print('Usage: touch <filename>', 'warning');