data(pricing): verify official prices 2026-07-27 - #4

Summary

• Reverified all 21 records against official provider sources
• Updated accessed_at and last_verified_at to 2026-07-27
• Added Grok 4.3 cached and batch pricing
• Corrected Claude Sonnet 5 introductory pricing effective date
• Updated Mistral Large to current Mistral Large 3 alias pricing
• Preserved null values for unresolved Command A+ token pricing
• Regenerated metadata, API outputs, history and snapshots

Confirmed changes

• Grok 4.3 cached input: null -> $0.20/M
• Grok 4.3 batch input: null -> $1.00/M
• Grok 4.3 batch output: null -> $2.00/M
• Sonnet 5 effective_from: 2026-07-05 -> 2026-06-30
• Mistral Large input: $2.00/M -> $0.50/M
• Mistral Large output: $6.00/M -> $1.50/M
• Mistral cached input: null -> $0.05/M
• Mistral batch input: $1.00/M -> $0.25/M
• Mistral batch output: $3.00/M -> $0.75/M

Validation

• python scripts/build.py
• python scripts/validate.py
• python -m unittest discover -s tests
• git diff --check