Blueprint change impact preview

Open a pull request that modifies a blueprint and Ryvn automatically posts a change impact analysis on the PR. Each affected blueprint gets a one-line rollup of affected installations — expand any row for the per-installation plan showing resources added, modified, removed, or flagged for attention, using the same structured diff vocabulary as ryvn plan. The analysis runs on every PR validation with no setup required, so your team can review the blast radius before merging.