Pinscope open-source core

Agentic schematic validation: datasheet extraction via Claude Console
Skills, netlist/BOM design graph, per-IC direct datasheet review with
page citations, capacitor derating, Next.js report UI.

Extracted from the Pinscope cloud codebase. Auth and billing live in the
private gateway repo behind stable seams (billing_hook.py, adapter files
listed in CLAUDE.md).

backend/.env.example

@@ -0,0 +1,66 @@
+# Pinscope Backend — Environment Variables
+# Copy to .env and fill in values. Only ANTHROPIC_API_KEY is required.
+
+# -- AI ----------------------------------------------------------------------
+ANTHROPIC_API_KEY=sk-ant-...
+ANTHROPIC_MODEL=claude-sonnet-4-6
+# Per-stage Anthropic model overrides (leave empty to use ANTHROPIC_MODEL)
+MODEL_PINTABLE=
+MODEL_PATTERN=
+MODEL_VALIDATION=
+
+# -- AI provider routing -----------------------------------------------------
+# Default provider for every stage; per-stage env vars override.
+# Valid values: anthropic | gemini
+PROVIDER_DEFAULT=anthropic
+# Set a specific stage to "gemini" to route just that stage to Gemini
+# (leaves the rest on Anthropic). Skills-based extraction stages
+# (pintable / pattern / specs) require Anthropic — Gemini has no
+# equivalent of Anthropic Console Skills.
+# PROVIDER_VALIDATION=gemini
+# PROVIDER_POWER_TREE=gemini
+# PROVIDER_AUTO_RESOLVE=
+
+# -- Gemini (required when any PROVIDER_* is set to "gemini") ----------------
+GEMINI_API_KEY=
+GEMINI_MODEL=gemini-3-flash-preview
+# Per-stage Gemini model overrides (leave empty to use GEMINI_MODEL)
+# MODEL_VALIDATION_GEMINI=
+# MODEL_POWER_TREE_GEMINI=
+
+# -- Per-stage fallback ------------------------------------------------------
+# If set, the stage retries once with FALLBACK_PROVIDER_<STAGE> /
+# FALLBACK_MODEL_<STAGE> when the primary provider raises (e.g. Gemini 503
+# UNAVAILABLE). FALLBACK_MODEL_<STAGE> may be empty — defaults to that
+# provider's default model (ANTHROPIC_MODEL or GEMINI_MODEL). Leave
+# FALLBACK_PROVIDER_<STAGE> empty to disable fallback for that stage.
+# FALLBACK_PROVIDER_VALIDATION=anthropic
+# FALLBACK_MODEL_VALIDATION=claude-sonnet-4-6
+
+# -- Storage -----------------------------------------------------------------
+# Set GCS_BUCKET to store projects/library in Google Cloud Storage.
+# Leave empty for local mode (uses the data/ directory).
+GCS_BUCKET=
+
+# -- CORS --------------------------------------------------------------------
+# Frontend URL(s), JSON list
+CORS_ORIGINS=["http://localhost:3000"]
+
+# -- DigiKey (optional) ------------------------------------------------------
+# Enables datasheet auto-fetch and parameter-based passive auto-resolve.
+# DIGIKEY_CLIENT_ID=
+# DIGIKEY_CLIENT_SECRET=
+# DIGIKEY_ENVIRONMENT=production
+# DIGIKEY_LOCALE_SITE=US
+# DIGIKEY_LOCALE_LANGUAGE=en
+# DIGIKEY_LOCALE_CURRENCY=USD
+
+# -- Email notifications (optional) ------------------------------------------
+# Gmail API via domain-wide delegation. Leave EMAIL_SENDER empty to disable.
+# Service account credentials come from GOOGLE_APPLICATION_CREDENTIALS.
+EMAIL_SENDER=
+EMAIL_FRONTEND_URL=
+# Fixed admin email for pipeline-started notifications (leave empty to disable)
+EMAIL_ADMIN_NOTIFY=
+# Recipient for /api/contact form submissions (leave empty to disable)
+CONTACT_RECIPIENT=