Force every LLM stage onto DeepSeek and stop Anthropic Console uploads.

PROVIDER_*=anthropic and Claude fallbacks now coerce to DeepSeek, skills stay local, and default_model_version bumps without upload_skills.py.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/.env.example

@@ -26,17 +26,12 @@ DEEPSEEK_REASONING_EFFORT=high
 
 # -- AI provider routing -----------------------------------------------------
 # Default provider for every stage; per-stage env vars override.
-# Valid values: deepseek | anthropic | gemini
+# Valid values: deepseek | gemini  (anthropic is ignored and coerced to deepseek)
 PROVIDER_DEFAULT=deepseek
 # PROVIDER_VALIDATION=deepseek
 # PROVIDER_AUTO_RESOLVE=deepseek
 
-# -- Anthropic (optional fallback) -------------------------------------------
-# ANTHROPIC_API_KEY=sk-ant-...
-# ANTHROPIC_MODEL=claude-sonnet-4-6
-# MODEL_PINTABLE=
-# MODEL_PATTERN=
-# MODEL_VALIDATION=
+# Anthropic is not used. Do not set ANTHROPIC_API_KEY.
 
 # -- Gemini (optional) -------------------------------------------------------
 # GEMINI_API_KEY=
@@ -44,10 +39,9 @@ PROVIDER_DEFAULT=deepseek
 # MODEL_VALIDATION_GEMINI=
 
 # -- Per-stage fallback ------------------------------------------------------
-# If set, the stage retries once with FALLBACK_PROVIDER_<STAGE> /
-# FALLBACK_MODEL_<STAGE> when the primary provider raises.
-# FALLBACK_PROVIDER_VALIDATION=anthropic
-# FALLBACK_MODEL_VALIDATION=claude-sonnet-4-6
+# If set, the stage retries once. Anthropic is ignored (DeepSeek only).
+# FALLBACK_PROVIDER_VALIDATION=deepseek
+# FALLBACK_MODEL_VALIDATION=deepseek-flash
 
 # -- Storage -----------------------------------------------------------------
 # Set GCS_BUCKET to store projects/library in Google Cloud Storage.