feat: quarantine debt CI summary (#5)

Emit a structured quarantine report at the end of every run via
SkipperReporter. Markdown summary goes to GITHUB_STEP_SUMMARY (appended)
when the env var is set; falls back to stdout. skipper-report.json is
always written to the working directory.

Report fields: suppressedCount, expiringThisWeek, reenabledThisRun,
quarantineDaysDebt (Σ disabledUntil − today across active suppressions).

Wired into all four integrations (JUnit 5, TestNG, Cucumber, Playwright)
with no extra configuration required.

Release v1.1.0

Fix broken Javadoc @link reference in SkipperResolver