Initial commit with dev backbone template

SKILLS/20-repo-map.md

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+# Repo Mapping Skill
+
+When entering a repo:
+1) Read README.md
+2) Identify entrypoints (app main / server startup / CLI)
+3) Identify config (env vars, .env.example, config files)
+4) Identify test/lint scripts (package.json, pyproject.toml, Makefile, etc.)
+5) Write a 10-line "repo map" in the PLAN before changing code
+
+Output format:
+- Purpose:
+- Key modules:
+- Data flow:
+- Commands:
+- Risks: