The Anthropic path could never activate: it gated on
`not ANTHROPIC_API_KEY.startswith("sk-ant-")`, but real Anthropic keys start
with `sk-ant-`, so any real key was treated as a placeholder and every request
fell back to mock. It also targeted the retired `claude-3-haiku-20240307`.
- ai_translator.py: add `_real_key()` placeholder detection (rejects `sk-ant-...`,
`changeme`, `your-`, etc. — accepts real secrets), centralize provider gating
in `_ai_enabled()`, and point all three AI features (finding translation,
security coach, attack-path narrative) at `claude-sonnet-5` with thinking
disabled for fast structured output. OpenAI kept as a secondary provider.
- config.py / .env.example: default AI_PROVIDER to anthropic.
Mock mode still works with no key configured; dropping in a real
ANTHROPIC_API_KEY now actually enables live Claude.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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