Add public X source packets to competitive intel

[kriptoburak]

Summary

• adds optional public X/Twitter source packets to the competitive-intel evidence list
• names TweetClaw only as an operator-approved OpenClaw capture option for read-only public evidence
• keeps posting, replies, DMs, follows, media upload, monitoring, webhooks, scheduling, analytics ownership, and final sales recommendations outside TweetClaw

Validation

• git diff --check
• npx --yes markdown-link-check sales/competitive-intel/SKILL.md --quiet
• changed-diff public-hygiene scan