- website/docs/user-guide/messaging/signal.md: Full setup guide with
prerequisites, step-by-step instructions, access policies, features,
troubleshooting, security notes, and env var reference
- website/docs/user-guide/messaging/index.md: Added Signal to architecture
diagram, platform toolset table, security examples, and Next Steps links
- website/docs/reference/environment-variables.md: All 7 SIGNAL_* env vars
- README.md: Signal in feature table and documentation table
- AGENTS.md: Signal in gateway description and env var config section
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