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201fe04d8a
Wave 1 (correctness/trust): - Fix paid large-model dead path: engine reads the persisted selected repo via a thread-safe ModelManager.activeRepo(), so download/load/isReady now agree. - Lemon Squeezy store/product check fails closed in release builds — the placeholder-ID 'any key unlocks paid' bypass can no longer ship. - Replace force-unwrapped Hugging Face URLs with safe URLComponents construction. - Never read/replace/scan secure (password) fields via AX.isSecureTextField. Wave 2 (compounding seam): - Extract AIPromptKit (prompts/temperature/maxTokens/cleanup) out of MLXEngine so every backend produces identical prompts and output. - AIEngine gains protectedTerms (personal dictionary now actually injected into the LLM), warmup(), and runStreaming(); add makeAIEngine() factory. - Honor WritingMode.lengthCap for maxTokens; warm the model on launch/after download. - Guard custom modes against empty prompts and duplicate names. Wave 3: OllamaEngine — a URLSession-only AIEngine backend (cross-platform, opt-in via GRAMMARGEM_AI_BACKEND=ollama). Wave 4: LocalEngineServer — loopback-only, token-authed HTTP bridge (Network.framework, no new deps), off by default, exposing Harper + the LLM + the entitlement gate to a browser extension. Tests: 6 new unit tests for the AIPrompts seam and custom-mode guard (19 pass). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>