docs(website): website improvements

[zantvoort]

Copy and accuracy improvements across the website and docs:

• Benchmarks: reworded the matrix reading ("Each library excels in certain areas").
• Comparison page and docs: clarified Exposed N+1 handling (manual joins in the DSL, eager-load in the DAO) and switched propagation-mode wording from "all standard" to "Spring-style".
• Comparisons: every framework section now carries a "Comparison reviewed against . Last reviewed: ." line, plus a consolidated version list under the feature tables.
• Changelog cleanup for 1.13.0.
• Regenerated llms-full.txt.