refactor(recipe): reduce rule-engine complexity

[Trecek]

Recipe validation had complexity debt in 58 functions across 40 rule files. This change consolidates repeated routing, binding, and document analysis and separates cohesive parsing and graph queries. All 58 candidates have lower measured complexity; 37 now score 10 or below.

Preserves rule registration and entry signatures, diagnostic text and ordering, and existing error behavior. Fifteen focused characterization cases cover the preservation gaps identified in the plan. The full candidate and helper measurements are recorded in #4992.

Validation:

• Full repository suite: 47,692 passed, 781 skipped, 34 expected failures.
• Recipe suite: 5,621 passed, 225 skipped; all six focused groups passed.
• pre-commit run --all-files passed; all 140 registered rule definitions and signatures match the baseline.
• The complexity checker completed in unchanged warn mode with one documented warning: _no_go_route_findings scores 12. Its complete per-audit route analysis remains together; no thresholds or exemptions were changed.

Closes #4992.