Report: longer content — arch summary, findings table, full minor blocks

[serenakeyitan]

Refs #29.

Makes the report longer so users have more to fix — without inventing findings or breaking the deterministic score. All new content is OUTSIDE the share card (the card is byte-untouched).

What's new (all outside the card)

• 🧬 What Even Is This — a savage-but-TRUE architecture summary: what the thing is (stack/shape/wiring), roasted. New arch_summary / arch_transition fields. Fact discipline (hard rule): every architectural claim must point at a real file (package.json deps, dir layout, config) — backtick refs render as <code>. New Voice-register rule enforces it. Then a one-line transition into the professional fix zone.
• 🎯 Findings by Priority — an overview table of every emitted finding, worst-first, derived from dimensions[].findings[] (no new required field).
• Minor tier → full fix blocks — markdown's "Also Noted" was a one-liner list; now every Medium/Low gets the same Evidence / Root cause / The fix / Verify as a blocker (the HTML renderer already did this). Renderer accepts a Low tag.

Contract synced (3 points)

skill SKILL.md schema + render-report.mjs + report-template.html, mirrored on the website side (scanSample.ts + api/reports validateReport + ScanReport.astro) in the paired website PR.

Verification

• render-report.test.mjs: 17/17 pass.
• Rendered the fixture and viewed it in a real browser: all 5 banners render (What Even Is This → Score Breakdown → Findings by Priority → Must-Fix → Also Noted), arch <code> chips escaped safely, card untouched, no horizontal overflow.
• example-report.md updated to the new shape; corrected a stale hosted-URL + link-CTA in the example to the S3 report.first-tree.ai/<key>.html form and the no-link teaser.

🤖 Generated with Claude Code