Add Round 0 results, host info, and run layout improvements

- Add round-0 benchmark results (6 servers, 20 tests)
- Add host metadata to run data files (cpu, ram, os, docker)
- Display host info in run header via Run layout (loaded from data, not passed as prop)
- Add RunHost type to types.ts
- Update scoring.mdx imputation formula

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: orlandow

scripts/lib/constants.ts

@@ -4,7 +4,7 @@ export const VU_LEVELS = [1, 10, 50] as const;
 
 // Imputation percentile — used with a 0 floor prepended to the participant pool.
 // See METHODOLOGY.md for the full imputation algorithm.
-export const IMPUTE_PERCENTILE = 30;
+export const IMPUTE_PERCENTILE = 15;
 
 export const TESTS = [
   'k6/FS/FS01.js',