Detailed wiki content repair: Setup

Setup.md

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+# Setup
+
+## Proven Setup Signals
+
+| Signal | Detail |
+|---|---|
+| platformio.ini | envs=heltec_tracker_cardkb; boards=heltec_wireless_tracker; frameworks=arduino |
+| docker-compose | services=meshtastic-node |
+| Dockerfile | Container build file is present. |
+| README files | README.md, firmware/.clusterfuzzlite/README.md, firmware/README.md, firmware/branding/README.md, firmware/extra_scripts/README.md, firmware/meshtestic/README.md, firmware/protobufs/README.md |
+
+## Setup Path
+
+- Use PlatformIO for firmware builds; confirm environment and board before flashing.
+- Use Docker Compose for service orchestration after reviewing volumes, ports, and environment variables.
+
+## Environment Rules
+
+- Keep local secrets out of Git.
+- Put generated build output outside source control.
+- Prefer a clean checkout when validating setup instructions.
+- Record the exact command that works in the readiness issue before closing it.
+
+## Current Gaps
+
+- No setup gaps were inferred from inspected evidence.