java-jacoco-coverage-backfilllisted

# Java JaCoCo Coverage Backfill (Universal) ## When to use - User asks to add/fix Java tests. - User asks to improve coverage. - User asks for branch-gap based supplementary tests. - Project is Maven or Gradle based. ## Goals - Use JaCoCo XML as the coverage source of truth. - Track four coverage metrics consistently: `CLASS`, `METHOD`, `LINE`, `BRANCH`. - Prioritize classes with worst `BRANCH` coverage for test backfill. - Raise branch quality without causing regression on other coverage dimensions. ## Coverage Model - `CLASS`: covered classes / total classes - `METHOD`: covered methods / total methods - `LINE`: covered lines / total lines - `BRANCH`: covered branches / total branches - Primary backfill target metric: `BRANCH` - Secondary guardrail metrics: `CLASS`, `METHOD`, `LINE` ## Inputs And Defaults - Class selection: 10 lowest `BRANCH`-coverage classes with branch counters. - Default threshold: `BRANCH >= 80%` for each selected class. - Secondary constraint: no unexplained regression in `CLASS/METHOD/LINE` for selected classes. - If user provides different thresholds/scope/metric priorities, follow user input. ## Important: Where Files Go | Location | What Goes There | | ------------------------------------------------------------ | --------------- | | Skill directory (`${HOME}/.codex/skills/java-jacoco-coverage-backfill`) | scripts | ## Bundled Scripts (Use First) Scripts are under `scripts/` and