feat: initial project setup with bash-based NREL analysis

- Add bash script (siter-solar-analysis.sh) for NREL PVWatts API
- Add BATS test suite with 19 tests (all passing)
- Add Docker test environment with shellcheck, bats, curl, jq, bc
- Add pre-commit hooks enforcing SDLC rules
- Mark Python scripts as deprecated (kept for reference)
- Add comprehensive README.md and AGENTS.md documentation
- Add .env.example for configuration template
- Add .gitignore excluding private data (base-bill/, .env)
- Add SVG diagrams for presentation
- Redact all private location data (use SITER placeholder)

All work done following SDLC: Docker-only development, TDD approach,
conventional commits, code/docs/tests synchronized.

Generated with Crush

Assisted-by: GLM-5 via Crush <crush@charm.land>

.env.example

@@ -0,0 +1,11 @@
+# SITER Solar - Environment Configuration
+# Copy this file to .env and fill in your values
+
+# NREL API Key (required for solar production estimates)
+# Get your free API key at: https://developer.nrel.gov/signup/
+NREL_API_KEY=DEMO_KEY
+
+# Site Location (optional - defaults to central Texas coordinates)
+# These are used by the NREL PVWatts API for production estimates
+SITER_LAT=30.44
+SITER_LON=-97.62