fix(frontend-slides): make relative PDF output paths absolute before export

The "resolve output to absolute path" step only rebuilt
"$OUTPUT_DIR/$(basename ...)", so ./slides.pdf stayed relative. The
script then cd's into a temp dir, Playwright writes the PDF there, and
the temp dir is deleted. The script prints "PDF exported successfully!"
and then fails on du under set -e, with no PDF produced. This is the
script's own documented example.

Resolve the output directory with cd + pwd, as the input path already
does, and add a stubbed regression test (no network or browser).

Signed-off-by: Wen <jwcastillo@gmail.com>

manifests/context-packs/skill-triggers@1.json

@@ -10,7 +10,7 @@
     "id": "hand-seeded",
     "source": "manual-curation-pending-regeneration"
   },
-  "registryDigest": "498caee2738006d64530e9be34883111cf67742d8c4389f39d61299e1a1c4400",
+  "registryDigest": "b133a28198126c63f6c9a0b10688c0144cac10dd9a1b2305f4fd1e88187888e5",
   "schemaVersion": 1,
   "triggers": {
     "skill:agent-runtime-gateway-smoke-test": [

skills/frontend-slides/scripts/export-pdf.sh

@@ -82,10 +82,10 @@ else
     OUTPUT_PDF="$(dirname "$INPUT_HTML")/$(basename "$INPUT_HTML" .html).pdf"
 fi
 
-# Resolve output to absolute path
+# Resolve output to absolute path (the export later runs from a temp dir that is deleted)
 OUTPUT_DIR=$(dirname "$OUTPUT_PDF")
 mkdir -p "$OUTPUT_DIR"
-OUTPUT_PDF="$OUTPUT_DIR/$(basename "$OUTPUT_PDF")"
+OUTPUT_PDF="$(cd "$OUTPUT_DIR" && pwd)/$(basename "$OUTPUT_PDF")"
 
 echo ""
 echo -e "${BOLD}========================================${NC}"

tests/skills/frontend-slides-export-pdf.test.js

@@ -0,0 +1,77 @@
+#!/usr/bin/env node
+/**
+ * Stubbed run of skills/frontend-slides/scripts/export-pdf.sh: npm, npx and
+ * node are replaced by stubs, so no network or browser is needed.
+ *
+ * Run with: node tests/skills/frontend-slides-export-pdf.test.js
+ */
+
+'use strict';
+
+const assert = require('assert');
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const { spawnSync } = require('child_process');
+
+const SCRIPT = path.join(__dirname, '..', '..', 'skills', 'frontend-slides', 'scripts', 'export-pdf.sh');
+
+function test(name, fn) {
+  try {
+    fn();
+    console.log(`  ✓ ${name}`);
+    return true;
+  } catch (err) {
+    console.log(`  ✗ ${name}`);
+    console.log(`    Error: ${err.message}`);
+    return false;
+  }
+}
+
+function runTests() {
+  console.log('\n=== Testing frontend-slides export-pdf.sh ===\n');
+
+  if (process.platform === 'win32') {
+    console.log('  - skipped: bash script test on Windows');
+    console.log('\nPassed: 0');
+    console.log('Failed: 0');
+    return;
+  }
+
+  let passed = 0;
+  let failed = 0;
+
+  if (test('writes a relative output path next to the caller, not into the deleted temp dir', () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), 'slides-export-'));
+    try {
+      const bin = path.join(root, 'bin');
+      const work = path.join(root, 'work');
+      fs.mkdirSync(bin);
+      fs.mkdirSync(work);
+      // npm/npx succeed without doing anything; open/xdg-open must not launch a viewer.
+      for (const name of ['npm', 'npx', 'open', 'xdg-open']) {
+        fs.writeFileSync(path.join(bin, name), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
+      }
+      // node stub writes the PDF to the output path argument, resolved against its cwd.
+      fs.writeFileSync(path.join(bin, 'node'), '#!/bin/sh\nprintf "%%PDF-stub" > "$4"\n', { mode: 0o755 });
+      fs.writeFileSync(path.join(work, 'presentation.html'), '<html></html>\n');
+
+      const result = spawnSync('bash', [SCRIPT, './presentation.html', './slides.pdf'], {
+        cwd: work,
+        encoding: 'utf8',
+        env: { ...process.env, PATH: `${bin}${path.delimiter}${process.env.PATH}` },
+      });
+
+      assert.strictEqual(result.status, 0, result.stdout + result.stderr);
+      assert.ok(fs.existsSync(path.join(work, 'slides.pdf')), 'slides.pdf was not written to the working directory');
+    } finally {
+      fs.rmSync(root, { recursive: true, force: true });
+    }
+  })) passed++; else failed++;
+
+  console.log(`\nPassed: ${passed}`);
+  console.log(`Failed: ${failed}`);
+  process.exitCode = failed > 0 ? 1 : 0;
+}
+
+runTests();