fix(cowork.sh): WARNING on Patch 2a/2b inner anchor miss (#576)

D5 of #559's followup. Patch 2a (vmClient log gate, line 107) and
Patch 2b (vm module assignment, line 123) had no else branch on the
inner anchor regex. A miss silently ships a half-patched asar — the
exact PR #555 failure mode that took hours to diagnose because the
build log printed "Applied 10 cowork patches" with no warning.

Three-branch pattern matches Patch 4b at line 227-234:
- regex matches: patch + log + count
- post-patch literal already in code: "already applied"
- otherwise: WARNING naming the patch site

Empirically validated against the pinned 1.5354.0 installer:
deliberately broke the 2a anchor (replaced "vmClient" with "XXMISSXX"
in the regex) → WARNING fires, verify-cowork-patches.sh from PR #575
catches missing vmclient-log-gate marker. Same for 2b. Baseline
unchanged: no new WARNINGs on a fresh upstream.

Refs #559. Builds on #575 (D6 verification scaffolding).

Co-authored-by: Claude <claude@anthropic.com>

scripts/patches/cowork.sh

@@ -109,6 +109,13 @@ if (vmClientLogMatch) {
             '(' + win32Var + '||process.platform==="linux")$1');
         console.log('  Patched VM client log check for Linux');
         patchCount++;
+    } else if (code.includes(
+        '||process.platform==="linux")?"vmClient (TypeScript)"'
+    )) {
+        console.log('  VM client log gate already applied (Patch 2a)');
+    } else {
+        console.log('  WARNING: Could not find anchor for VM client log' +
+            ' gate (Patch 2a) — half-patched asar will fail Cowork startup');
     }
 
     // 2b: Patch the actual module assignment
@@ -125,6 +132,12 @@ if (vmClientLogMatch) {
             '(' + win32Var + '||process.platform==="linux")$1');
         console.log('  Patched VM module assignment for Linux');
         patchCount++;
+    } else if (/\|\|process\.platform==="linux"\)\??\(?[\w$]+=\{vm:[\w$]+\}/.test(code)) {
+        console.log('  VM module assignment already applied (Patch 2b)');
+    } else {
+        console.log('  WARNING: Could not find anchor for VM module' +
+            ' assignment (Patch 2b) — half-patched asar will fail' +
+            ' Cowork startup (PR #555 failure mode)');
     }
 } else {
     console.log('  WARNING: Could not find vmClient variable for module loading patch');