[Feature] Job detail Build + Audit tabs

New diagnostic tabs on /admin/factory/job/[id]. See exact compiler errors, repair attempts side-by-side, full build log, and scoped audit trail.

Per-cycle repair attempts with errors-before vs errors-after

Build summary cards: pass/fail + exit code + duration + cycle count

Lazy-loaded audit table with status badges + per-step durations

Shipped in: #5133