Name output files after source documents for easy identification

SKILL.md

@@ -80,7 +80,11 @@ See `references/extraction-guide.md` for detailed type handling, confidence crit
 - Append `(?)` to low-confidence values
 - Truncate values longer than 60 characters with `...`
 
-**Save a JSON file** to `./extraction-results-YYYY-MM-DD.json` in the current working directory.
+**Save a JSON file** in the same directory as the source file(s):
+- **Naming convention**: derive the output filename from the source file. Strip the extension and append `-extraction.json`. Examples:
+  - `Orenda Proposal.pdf` → `Orenda Proposal-extraction.json`
+  - `Contract v2.docx` → `Contract v2-extraction.json`
+  - For multiple source files, use the common parent directory name: `<directory-name>-extraction.json`
 - Use the schema documented in `references/extraction-guide.md`
 - Include metadata: timestamp, source path, document count, skipped files