- **CI:** added line-coverage measurement and a threshold gate. `ci.yml` switches `coverage: none` → `coverage: pcov` on both 8.4 and 8.5 matrix legs (PCOV is line-coverage-only and faster than Xdebug — debugger features aren't needed). New composer scripts: `test:coverage` (runs PHPUnit with `--coverage-clover=build/logs/clover.xml --coverage-text`) and `coverage:check` (runs `bin/coverage-check.php`, a standalone clover parser — no extra runtime dependency added to a static-analysis package for a single CI gate). Two new CI steps replace the `Tests` step: **Tests with coverage** and **Coverage threshold gate**. Clover XML is uploaded as a per-leg artifact (`clover-php-${{ matrix.php }}`, 14-day retention) so reviewers can inspect uncovered lines without spelunking through workflow logs. **Initial threshold: 83%** — the measured baseline is 83.92% (240/286 lines across `src/`), set 0.92 percentage points lower to absorb trivial fluctuation on equivalent-but-renamed code. Class coverage (0/6) and method coverage (39%) are intentionally unmeasured by the gate v1; per the issue's deliberation, line coverage is the right v1 signal and branch/method coverage is a follow-up after the line gate is bedded in. The 16-percentage-point gap to 100% audits as defensive guard clauses on unexpected node shapes (the kind of branch the issue itself flagged as "genuinely hard to fixture" — `LogRule`'s static-call branch falls back when `$node->class` is `Expr` rather than `Name`); a follow-up issue will audit and ratchet the threshold upward to 90%+. Versioning: none (pure CI/test-infra, no consumer-visible behaviour). Resolves issue #9.
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