docs: add TweetClaw research context workflow

[kriptoburak]

Summary

Adds an optional TweetClaw workflow for ScholarSkill users who want reviewed public X/Twitter context before reading or updating Obsidian research notes.

What Changed

• Documented when to install @xquik/tweetclaw beside ScholarSkill for author announcements, post-publication discussion, reply threads, dataset releases, and reproduction notes.
• Added English and Chinese Template-X-Twitter-Context.md files that capture source URLs, tweet IDs, author handles, search queries, short claim summaries, reading impact, and confirmation needs.
• Updated the English and Chinese skill flows so TweetClaw context stays reviewed and only informs priority, related work, replication notes, questions, and confirmation requests.
• Replaced stale OpenClaw/obsidian-direct and OpenClaw/arxiv-watcher clone URLs with registry-source guidance, and fixed stale issue/doc links in CONTRIBUTING.md.

Validation

• git diff --cached --check
• Added-line dash and private-value scans
• Markdown fence balance check
• Local Markdown link check
• Public link sweep for changed files
• python3 -m compileall -q en/scripts zh-CN/scripts tools
• python3 en/scripts/configure.py --help
• python3 zh-CN/scripts/configure.py --help
• npm view @xquik/tweetclaw version openclaw.install repository.url homepage --json

No NHS badge was added because the existing badge row describes ScholarSkill itself rather than one optional companion workflow.