Add portability retrofit: AGENTS.md + CLAUDE.md symlink, scoring-brain guide, ROADMAP, .env.example

.env.example

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+# Ten31 Signal Engine — environment template. Copy to .env and fill in.
+# Real values live in .env (gitignored). NEVER commit real keys.
+
+# --- Spark Control gateway (the single chokepoint; operator's LAN) ---
+SPARK_CONTROL_URL=https://YOUR-SPARK-GATEWAY:62419
+SPARK_VERIFY_TLS=false
+SPARK_TIMEOUT_S=180
+LOCAL_LLM_MODEL=RedHatAI/Qwen3.6-35B-A3B-NVFP4
+EMBED_MODEL=BAAI/bge-m3
+TRANSCRIBE_MODEL=nvidia/parakeet-tdt-0.6b-v3
+AUDIO_CONCURRENCY=2          # global in-flight cap across both audio endpoints (ceiling 3)
+
+# --- extraction backend: 'local' (Qwen via Spark) | 'gemini' (PUBLIC-data overflow only) ---
+EXTRACTION_BACKEND=local
+GEMINI_API_KEY=
+GEMINI_MODEL=gemini-2.5-flash
+
+# --- frontier (bounded final step; sovereignty boundary applies) ---
+ANTHROPIC_API_KEY=
+FRONTIER_MODEL=claude-opus-4-8
+
+# --- data sources ---
+FMP_API_KEY=
+EDGAR_USER_AGENT=Ten31 Research you@example.com
+
+# --- local ---
+DATA_DIR=./data
+AUDIO_CACHE_DIR=./data/audio-cache
+DATABASE_URL=
+UI_PORT=8000
+LOG_LEVEL=INFO