test: add QED score workflow and update README with actions section

[onebit0fme]

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[github-actions]

QED Quality Score · qed.systems

README.md scored against qed.compelling-readme — 73/100

  concrete_usage_demonstration  ███████████████░░░░░   74  ●●○  Developing  ↑13
  copy_pasteable_setup          ███████████░░░░░░░░░   55  ●●○  Developing  ↑33
  hook_speed                    █████████████████░░░   83  ●●○  Developing  ↑3
  hype_free_credibility         ███████████████░░░░░   77  ●●○  Developing  ↑3
  problem_framing               █████████████░░░░░░░   67  ●●○  Developing  ↑20
  progressive_disclosure        ████████████████░░░░   78  ●●○  Developing  ↑10
  structural_scannability       ███████████████░░░░░   75  ●●○  Developing  ↑10
  value_proposition_clarity     ████████████████░░░░   81  ●●○  Developing  ↑7
  ────────────────────────────  ────────────────────  ───
  Composite                     ███████████████░░░░░   73  ●●○  Developing  ↑33

  ●●● high  ●●○ moderate  ●○○ low confidence   ↑n headroom to Solid