fix: enhance download-docs skill to handle working-directory and update metadata file extension

.opencode/skills/download-docs/SKILL.md

@@ -67,8 +67,11 @@ Fetch each via raw URL:
 https://raw.githubusercontent.com/{owner}/{repo}/{branch}/{ci_file}
 ```
 
-Scan content for keywords like `ref:`, `branch:`, `gh-pages`, `checkout`.
+Scan content for keywords like `ref:`, `branch:`, `gh-pages`, `checkout`,
+`working-directory`.
 If a specific docs branch is found, update `BRANCH` and re-run Step 2.
+If a `working-directory:` line is found (e.g. `working-directory: ./www`),
+extract that path and prepend it to `DOC_LOCATIONS` so it is tried first.
 
 ### Step 4 — Recursive download
 
@@ -104,7 +107,7 @@ For each downloaded file:
 1. Reconstruct the relative path under `{ARTIFACT_DIR}/{repo}/{file_path}`.
 2. Create parent directories with `Path.mkdir(parents=True, exist_ok=True)`.
 3. Write file content (UTF-8, errors=`replace`).
-4. Write `.meta.json` sidecar at `{out_path}.meta.json`.
+4. Write `.json` sidecar at `{out_path.with_suffix('.json')}`.
 
 **Metadata fields**:
 ```json
@@ -257,7 +260,7 @@ def process_dir(api_path):
                 "content_type": r.get("content_type", "text/plain"),
                 "downloaded_at": now_iso,
             }
-            meta_path = out_path.parent / (out_path.name + ".meta.json")
+            meta_path = out_path.with_suffix(".json")
             meta_path.write_text(json.dumps(meta, indent=2), encoding="utf-8")
 
             downloaded += 1