docrot v1.3.0 — Wave-3 report section, 3-tier empirical proof, and outcome receipts

What's new in v1.3.0

• Wave-3 report section (generate_report.py): accepts an optional 6th CLI argument (wave3-results.json) and renders the companion section "A third wave: one star tier down" with its own KPIs, a 3-tier cross-wave narrative, and the per-wave findings table.
• Empirical milestone: 300 repositories scanned across three tiers (top-100, ≥15k stars, 10k–15k stars). The share of repositories carrying at least one broken documentation image stays remarkably steady: 26/100 → 27/100 → 30/100. Rot is not a quirk of the absolute top of GitHub; it is an intrinsic property of documentation maintenance across star tiers.
• Upstream outcomes (18 receipts):
  • sml2h3/ddddocr#317: all 26 off-repo images on author CDN cdn.wenanzhe.com return HTTP 404; sponsor table and captcha demos broken in READMEs.
  • Azure/azure-quickstart-templates#14882: all 892 CI/deployment status badges on azurequickstartsservice.blob.core.windows.net return HTTP 409 PublicAccessNotPermitted across 146 READMEs.
  • aalansehaiyang/technology-talk#84: author's personal docsite offercome.cn is completely unreachable (HTTPS timeout); 477 unique off-repo images dead across docs/md/**.
• Documentation & tests: README updated with the full wave-3 results, record-rot analysis, and the 6-argument CLI signature. Suite expanded to 69 tests (+5 covering wave-3 report rendering, cross-wave narratives, error disclosure, and HTML escaping).
• Live report: codebyaurora.com/docrot/ updated and deployed with md5 parity.