[Nauxie]

Summary

• scope 15% relative variance to the short camera-route average only
• keep camera p95 and longer-route timing comparisons at 10%
• restore default 10%/+5 structural count regression checks
• lock and document the comparison contract

Verification

• cargo fmt --check
• cargo check --all-targets
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-targets --all-features
• synthetic comparator boundaries for camera average and visible-detail growth