Merge PR #48: feat: add Xiaohongshu source + Reddit public fallback

- Xiaohongshu search via local MCP service (opt-in, zero impact if service not running)
- Reddit public JSON fallback (works with zero API keys)
- Reddit priority: ScrapeCreators -> OpenAI -> public fallback
- Updated env.py: Reddit always available via public fallback

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

CLAUDE.md

@@ -0,0 +1,21 @@
+# last30days Skill
+
+Claude Code skill for researching any topic across Reddit, X, YouTube, and web.
+Python scripts with multi-source search aggregation.
+
+## Structure
+- `scripts/last30days.py` — main research engine
+- `scripts/lib/` — search, enrichment, rendering modules
+- `scripts/lib/vendor/bird-search/` — vendored X search client
+- `SKILL.md` — skill definition (deployed to ~/.claude/skills/last30days/)
+
+## Commands
+```bash
+python3 scripts/last30days.py "test query" --emit=compact  # Run research
+bash scripts/sync.sh                                        # Deploy to ~/.claude, ~/.agents, ~/.codex
+```
+
+## Rules
+- `lib/__init__.py` must be bare package marker (comment only, NO eager imports)
+- After edits: run `bash scripts/sync.sh` to deploy
+- Git remotes: origin=private, upstream=public