Make the score check catch declarative rules and broken wraps #2132

Part of #2124.

tools/score_templates.py rates backend/http.md 97.8 and security/security.md 96.1. Both are in the older declarative style that #2131 rewrites, so the floor of 95 cannot hold the style.

• Flag a rule bullet that opens with a subject, not a verb: "Handlers are thin", "X MUST be"
• Flag a wrap that leaves a line holding only a dash or one word
• Add a planted case for each

Done when

• The listed templates score lower before Rewrite the declarative templates as imperatives #2131 than after it
• Planted cases pass and the floor still holds on main
• A rule keeps when it applies, what to do, and its main exception; no metric rewards dropping one
• The scorer's doc states it measures form, not usefulness or correctness