First public release

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

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+# Changelog
+
+## 0.3.0 - 2026-09-28
+
+First public release under MIT.
+
+- `slaReport()` computes availability over a half-open window, charges
+  downtime per failing sample capped at one probe interval, and excludes
+  scheduled maintenance.
+- Zero samples gives `uptime_pct: null`, never 100. No target gives
+  `met: null`, never a pass or a failure.
+- `toReport()` and `formatSla()` produce an `@extant2000/evidence-record`
+  report. Zero samples with a target is not assessed, not a missed SLA.
+- `describeAvailability()` and `describeTarget()` put the null cases into
+  plain sentences.