feat(3 U2-scaffold): summary card + level/status SVG badge renderers (offline; pure)
harness/card.py: render_badge_svg/level_badge_svg (shields-style SVG, colour-by-level, R6) +
render_card_html (recipe+version, level badge, per-stage/per-test ✔/✘ table, embedded screenshot,
invariant flags — REPORTS results.json verbatim, never recomputes; cardinal no-inflation guardrail)
+ render_card_png (best-effort Playwright HTML->PNG, R7). 8 pure unit tests. Orchestrator wiring +
stable-URL serving + live PNG demo come after U0 PASSes.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>