feat(web-test): auto-detect 1C errors and stop script execution

Action functions (clickElement, fillFields, selectValue, etc.) are now
wrapped to check for 1C errors (modal dialogs, validation balloons)
after each call. When detected, execution stops immediately with full
diagnostic context:

- error: human-readable 1C error message
- step: which API function triggered the error
- stepArgs: arguments passed to that function
- onecErrors: raw balloon/messages/modal data from DOM
- formState: complete form state at the moment of error
- screenshot: auto-captured error-shot.png

This enables autonomous scripts (run mode) to fail fast with enough
information for the caller (agent or human) to diagnose and decide on
corrective action.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/skills/web-test/scripts/run.mjs

@@ -113,6 +113,29 @@ async function executeScript(code) {
     exports.writeFileSync = writeFileSync;
     exports.readFileSync = readFileSync;
 
+    // Wrap action functions to auto-detect 1C errors (modal, balloon)
+    // and stop execution immediately with diagnostic info
+    const ACTION_FNS = [
+      'clickElement', 'fillFields', 'selectValue', 'fillTableRow',
+      'deleteTableRow', 'openCommand', 'navigateSection', 'closeForm',
+      'filterList', 'unfilterList'
+    ];
+    for (const name of ACTION_FNS) {
+      if (typeof exports[name] !== 'function') continue;
+      const orig = exports[name];
+      exports[name] = async (...args) => {
+        const result = await orig(...args);
+        const errors = result?.errors;
+        if (errors?.modal || errors?.balloon) {
+          const msg = errors.modal?.message || errors.balloon?.message || 'Unknown 1C error';
+          const err = new Error(msg);
+          err.onecError = { step: name, args, errors, formState: result };
+          throw err;
+        }
+        return result;
+      };
+    }
+
     const AsyncFunction = Object.getPrototypeOf(async function(){}).constructor;
     const fn = new AsyncFunction(...Object.keys(exports), code);
     await fn(...Object.values(exports));
@@ -124,7 +147,7 @@ async function executeScript(code) {
     console.log = origLog;
     console.error = origErr;
 
-    // Error screenshot — save with absolute path so model can view it
+    // Error screenshot
     let shotFile;
     try {
       const png = await browser.screenshot();
@@ -132,7 +155,17 @@ async function executeScript(code) {
       writeFileSync(shotFile, png);
     } catch {}
 
-    return { ok: false, error: e.message, output: output.join('\n'), screenshot: shotFile, elapsed: elapsed(t0) };
+    const result = { ok: false, error: e.message, output: output.join('\n'), screenshot: shotFile, elapsed: elapsed(t0) };
+
+    // Enrich with 1C error context if available
+    if (e.onecError) {
+      result.step = e.onecError.step;
+      result.stepArgs = e.onecError.args;
+      result.onecErrors = e.onecError.errors;
+      result.formState = e.onecError.formState;
+    }
+
+    return result;
   }
 }