fix: include devlog in site build

- copy devlog/ files to site-out/docs/devlog/
- change header link to use hash routing (#devlog/...) so SPA handles it

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[e-mail]>

scripts/build-wisp-docs.mjs

···
 
 const repoRoot = path.resolve(new URL("..", import.meta.url).pathname);
 const docsDir = path.join(repoRoot, "docs");
+const devlogDir = path.join(repoRoot, "devlog");
 const siteSrcDir = path.join(repoRoot, "site");
 const outDir = path.join(repoRoot, "site-out");
 const outDocsDir = path.join(outDir, "docs");
···
     if (!rel.startsWith("archive/")) {
       pages.push({ path: rel, title: normalizeTitle(titleFromMarkdown(md, rel)) });
     }
+  }
+
+  // Copy devlog files to docs/devlog/ (accessible via SPA but not in sidebar)
+  const devlogFiles = (await exists(devlogDir)) ? await listMarkdownFiles(devlogDir) : [];
+  for (const rel of devlogFiles) {
+    const src = path.join(devlogDir, rel);
+    const dst = path.join(outDocsDir, "devlog", rel);
+    await mkdir(path.dirname(dst), { recursive: true });
+    await cp(src, dst);
   }
 
   // Stable nav order: README homepage, then roadmap, then changelog, then the rest.

site/index.html

···
         </button>
         <a class="brand" href="./">zat.dev</a>
         <div class="header-links">
-          <a class="header-link" href="./devlog/">devlog</a>
+          <a class="header-link" href="#devlog/001-self-publishing-docs.md">devlog</a>
           <a class="header-link" href="https://tangled.sh/zat.dev/zat" target="_blank" rel="noopener noreferrer">repo</a>
         </div>
       </header>