add 6 skills to repo + update skill-review for xiaoming

- Add code-interpreter, kokoro-tts, remotion-best-practices,
  research-to-paper-slides, summarize, tavily-tool to source repo
- skill-review: add main/xiaoming agent mapping in handler.ts + SKILL.md
- tts-voice: handler.ts updates from agent workspace

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/code-interpreter/references/v4-usage.md

@@ -0,0 +1,29 @@
+# V4 Usage
+
+## Purpose
+
+Generate an automatic data analysis bundle from a local data file.
+
+## Command
+
+```bash
+/home/selig/.openclaw/workspace/.venv-code-interpreter/bin/python \
+  /home/selig/.openclaw/workspace/skills/code-interpreter/scripts/analyze_data.py \
+  /path/to/input.csv \
+  --artifact-dir /home/selig/.openclaw/workspace/.tmp/my-analysis
+```
+
+## Outputs
+
+- `summary.json` — machine-readable profile
+- `report.md` — human-readable summary
+- `preview.csv` — first 50 rows after parsing
+- `*.png` — generated plots when matplotlib is available
+
+## Supported inputs
+
+- `.csv`
+- `.tsv`
+- `.json`
+- `.xlsx`
+- `.xls`