fix(skills-hub): show every catalog source on /docs/skills (skills.sh, ClawHub, browse.sh, OpenAI, …) (#32336)

The Skills Hub page was stuck on a stale Feb 25 snapshot, showing only Built-in
+ Optional + Anthropic + LobeHub. The unified index already has 2078 skills
from skills.sh / ClawHub / LobeHub / GitHub taps / Claude Marketplace, and
BrowseShSource adds another ~330 — none of it was reaching the page.

Changes:

- website/scripts/extract-skills.py: read website/static/api/skills-index.json
  (the unified multi-source catalog, rebuilt twice daily) as the canonical
  external source. Keep the legacy skills/index-cache/ fallback for offline
  builds. Add friendly per-source labels (skills.sh, ClawHub, browse.sh,
  OpenAI, HuggingFace, Anthropic, LobeHub, etc.) and per-entry installCmd.
- website/src/pages/skills/index.tsx: add source pills + ordering for the 11
  new sources; render installCmd from the index entry.
- website/scripts/prebuild.mjs: when no local skills-index.json exists, fetch
  the live one from hermes-agent.nousresearch.com so local 'npm run build'
  matches production without burning GitHub API quota.
- scripts/build_skills_index.py: crawl BrowseShSource so browse.sh entries
  land in the unified index. Adjust source_order.
- tools/skills_hub.py: GitHubSource.DEFAULT_TAPS — openai/skills moved its
  skills into skills/.curated/ and skills/.system/, so add both as explicit
  taps (the listing code skips dotted dirs by design). Drop
  VoltAgent/awesome-agent-skills (README-only, no SKILL.md files) and
  MiniMax-AI/cli (singular skill, not a tap directory). Net effect: github
  source jumps from 83 → 143 skills, with OpenAI properly included.
- .github/workflows/deploy-site.yml: build the unified index BEFORE running
  extract-skills.py — previous order meant extract-skills always fell back
  to the legacy cache. Drop the 'skip if file exists' guard; the file is
  gitignored and must be rebuilt every deploy.
- .github/workflows/skills-index.yml: drop the broken 'deploy-with-index'
  job (it cp'd 'landingpage/\*' which no longer exists, failing every cron
  run since the landingpage move). Replace it with a workflow_dispatch
  trigger of deploy-site.yml so the index refresh still reaches production
  on schedule.
- website/docs/user-guide/features/skills.md: drop VoltAgent from the
  default-taps doc list to match the code.

Before: 695 skills (Built-in 90, Optional 84, Anthropic 16, LobeHub 505).
After:  2168 skills across 9 source pills, including the 1212 skills.sh
        entries the user expected to see.

website/scripts/prebuild.mjs

@@ -8,6 +8,13 @@
 // CI workflows still run the extraction explicitly, which is a no-op duplicate
 // but matches their historical behaviour.
 //
+// We also try to pull a fresh copy of skills-index.json (the unified
+// multi-source catalog) from the live docs site if it's not already on disk.
+// That way local `npm run build` doesn't have to wait on
+// scripts/build_skills_index.py crawling every skill source — which takes
+// several minutes and burns GitHub API quota — but still gets the same
+// 2000+ external skills the deployed site has.
+//
 // If python3 or its deps (pyyaml) aren't available on the local machine, we
 // fall back to writing an empty skills.json so `npm run build` still
 // succeeds — the Skills Hub page just shows an empty state, and llms.txt
@@ -15,7 +22,7 @@
 // deploys get real data.
 
 import { spawnSync } from "node:child_process";
-import { mkdirSync, writeFileSync, existsSync } from "node:fs";
+import { mkdirSync, writeFileSync, existsSync, statSync } from "node:fs";
 import { dirname, join, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
 
@@ -24,6 +31,10 @@ const websiteDir = resolve(scriptDir, "..");
 const extractScript = join(scriptDir, "extract-skills.py");
 const llmsScript = join(scriptDir, "generate-llms-txt.py");
 const outputFile = join(websiteDir, "src", "data", "skills.json");
+const unifiedIndexFile = join(websiteDir, "static", "api", "skills-index.json");
+const UNIFIED_INDEX_URL =
+  "https://hermes-agent.nousresearch.com/docs/api/skills-index.json";
+const UNIFIED_INDEX_MAX_AGE_MS = 24 * 60 * 60 * 1000; // 24h
 
 function writeEmptyFallback(reason) {
   mkdirSync(dirname(outputFile), { recursive: true });
@@ -51,6 +62,64 @@ function runPython(script, label) {
   return true;
 }
 
+async function ensureUnifiedIndex() {
+  // If we have a recent copy on disk, trust it.
+  if (existsSync(unifiedIndexFile)) {
+    try {
+      const age = Date.now() - statSync(unifiedIndexFile).mtimeMs;
+      if (age < UNIFIED_INDEX_MAX_AGE_MS) {
+        return true;
+      }
+      console.log(
+        `[prebuild] skills-index.json is ${(age / 3600000).toFixed(1)}h old; ` +
+          `refreshing from ${UNIFIED_INDEX_URL}`,
+      );
+    } catch {
+      // fall through to re-fetch
+    }
+  }
+
+  try {
+    const resp = await fetch(UNIFIED_INDEX_URL, {
+      headers: { accept: "application/json" },
+    });
+    if (!resp.ok) {
+      console.warn(
+        `[prebuild] skills-index.json fetch returned HTTP ${resp.status}; ` +
+          `using local copy if any`,
+      );
+      return existsSync(unifiedIndexFile);
+    }
+    const text = await resp.text();
+    // Sanity check: must be valid JSON with a skills array
+    try {
+      const parsed = JSON.parse(text);
+      if (!parsed || !Array.isArray(parsed.skills)) {
+        console.warn(
+          "[prebuild] skills-index.json from live site has no skills array; ignoring",
+        );
+        return existsSync(unifiedIndexFile);
+      }
+    } catch (e) {
+      console.warn(`[prebuild] skills-index.json from live site is not valid JSON: ${e}`);
+      return existsSync(unifiedIndexFile);
+    }
+    mkdirSync(dirname(unifiedIndexFile), { recursive: true });
+    writeFileSync(unifiedIndexFile, text);
+    console.log(
+      `[prebuild] downloaded skills-index.json from ${UNIFIED_INDEX_URL} ` +
+        `(${(text.length / 1024).toFixed(0)} KB)`,
+    );
+    return true;
+  } catch (e) {
+    console.warn(`[prebuild] skills-index.json fetch failed: ${e}`);
+    return existsSync(unifiedIndexFile);
+  }
+}
+
+// 0) Pull unified index if we don't have a fresh one.
+await ensureUnifiedIndex();
+
 // 1) skills.json — required for the Skills Hub page.
 if (!existsSync(extractScript)) {
   writeEmptyFallback("extract script missing");