security: remove supply chain risks, external promotions, and unauthorized credits

- Remove zenith.chat references and @DRodriguezFX shoutout from README
- Remove Inspiration Credits section (already in CHANGELOG.md)
- Remove awesome-agent-skills reference from Links
- Remove Plankton H3 section by @alxfazio (skill stays in skills/)
- Remove brand names (InsAIts, VideoDB, Evos) from v1.9.0 notes
- Remove @ericcai0814 individual credit from README (kept in CHANGELOG)
- Add Security Guide to Links section
- Replace curl-pipe-to-bash in autonomous-loops with review warning
- Replace git clone in plankton-code-quality with review warning
- Replace pip install git+ in agent-eval with review warning
- Replace npm install -g in dmux-workflows with review warning
- Add commercial API notice to nutrient-document-processing
- Remove VideoDB maintainer credit from videodb skill
- Replace skill-creator.app link with ECC-Tools GitHub App reference

skills/autonomous-loops/SKILL.md

@@ -235,9 +235,7 @@ Don't rely on agents to self-differentiate. The orchestrator **assigns** each ag
 
 ### Installation
 
-```bash
-curl -fsSL https://raw.githubusercontent.com/AnandChowdhary/continuous-claude/HEAD/install.sh | bash
-```
+> **Warning:** Install continuous-claude from its repository after reviewing the code. Do not pipe external scripts directly to bash.
 
 ### Usage