feat: blog engine v3 — 8-stage pipeline with Auto-Kill Layer
Complete rewrite of blog prompts and pipeline based on editorial
Gold-standard feedback. Replaces 3-pass system with 8-stage pipeline:
1. Master generation (narrative voice, no spec dumps)
2. Narrative Control (kill visible structure, enforce flow)
3. Auto-Kill Layer (remove AI phrases, spec residue, repetition)
4. Reduction Engine (cut 40% — keep strongest ideas only)
5. Depth pass (add specifics where vague, no spec dumps)
6. Quality Control (hard delete list validation)
7. Procurement layer (optional, sales audience)
8. LinkedIn post generation (new)
Key changes:
- System prompt rewritten with Hard Delete List (29 banned phrases)
- Soft Delete List for conditional phrases
- Auto-Kill categories A-J (spec blocks, formulas, whitepaper tone, etc.)
- Master prompts enforce continuous narrative, no section headings
- Word count targets reduced (800-1200 instead of 1500+)
- Scoring pass added (cleanliness, narrative, non-AI feel, relevance)
- LinkedIn companion post auto-generated
- Context data injection reduced (fewer items, no dump instructions)
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