style(citability): apply ruff format to new RAG check functions

feat(citability): add 5 RAG readiness checks, bump to v4.1.0 (#372, #365, #373, #366, #374)

content: reorganize articles — replace drafts with published versions

docs: add planned improvements roadmap and update MCP tools count

chore(release): bump version to v4.0.1

fix(cli): score bands in text output now generated from SCORE_BANDS config (#442)

refactor(core): extract @graph helper, centralize citability constants, update summary.json (#412, #433, #444)

fix(core): performance + cleanup — lru_cache syllables, dead code removal, error sanitization (#466, #431, #443)

docs(web): update version to v4.0.0 in all 6 templates (was beta.1)

docs: update README — min-score input, 10 MCP tools, 1120+ tests

chore(release): v4.0.0 stable — first production release of v4 architecture

chore(i18n): translate 4 remaining Italian strings in audit_content and citability

fix(web): 3 bugs found in pre-release code review

chore(release): bump version to v4.0.0-beta.4

fix(core): resolve 3 enhancement blockers for stable release (#429, #455, #409)