From 0d2df39339ca788bf75f492683079ccccf940000 Mon Sep 17 00:00:00 2001
From: Paul Bakaus <paul.bakaus@gmail.com>
Date: Fri, 28 Aug 2026 15:32:22 -0700
Subject: [PATCH] Root-relative stylesheet hrefs resolve against the project,
 not the drive root

Bugbot on #599: path.resolve treated /assets/hero.css as filesystem-absolute. Both the working directory and the artifact's directory are tried; unreadable candidates skip.

AI-assisted (Claude Code).
---
 skill/scripts/build-phase.mjs | 7 ++++++-
 tests/build-phase.test.mjs    | 3 +++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/skill/scripts/build-phase.mjs b/skill/scripts/build-phase.mjs
index 73b367e8a..47639d9b4 100644
--- a/skill/scripts/build-phase.mjs
+++ b/skill/scripts/build-phase.mjs
@@ -355,7 +355,12 @@ export function unreferencedPlates(spec, artifact = null) {
         const href = m[1];
         if (/^(https?:|data:|\/\/)/i.test(href)) continue;
         if (!/rel=["']?stylesheet/i.test(m[0]) && !/\.css(\?|$)/i.test(href)) continue;
-        linked.push(path.resolve(path.dirname(artifact), href.split('?')[0]));
+        const clean = href.split('?')[0];
+        // a root-relative href serves from the project root, not the drive
+        // root: try the working directory and the artifact's own directory
+        // (unreadable candidates are skipped by the corpus loop)
+        if (clean.startsWith('/')) { linked.push(path.join(process.cwd(), clean), path.join(path.dirname(artifact), clean)); }
+        else linked.push(path.resolve(path.dirname(artifact), clean));
       }
     } catch { /* the artifact still counts */ }
   }
diff --git a/tests/build-phase.test.mjs b/tests/build-phase.test.mjs
index cdcfa7162..68407d303 100644
--- a/tests/build-phase.test.mjs
+++ b/tests/build-phase.test.mjs
@@ -485,6 +485,9 @@ describe('unreferencedPlates', () => {
       fs.writeFileSync(path.join(d, 'index.html'), `<link rel="stylesheet" href="a/b/c/e/f/g/h/styles/deep.css"><main class="hero"></main>`);
       fs.writeFileSync(path.join(d, 'assets', 'hero.css'), '.hero { background: red; }');
       assert.deepEqual(unreferencedPlates(spec, path.join(d, 'index.html')), [], 'a stylesheet linked by the artifact counts wherever it lives');
+      // a root-relative href resolves against the project, not the drive root
+      fs.writeFileSync(path.join(d, 'index.html'), `<link rel="stylesheet" href="/a/b/c/e/f/g/h/styles/deep.css"><main class="hero"></main>`);
+      assert.deepEqual(unreferencedPlates(spec, path.join(d, 'index.html')), [], 'a root-relative stylesheet href counts');
       fs.writeFileSync(path.join(deep, 'deep.css'), '.hero { background: red; }');
       assert.equal(unreferencedPlates(spec, null).length, 1, 'an unreferenced plate is still named');
       assert.equal(unreferencedPlates(spec, path.join(d, 'index.html')).length, 1, 'and with the artifact set too');