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Locks the new conventions into rule files so future agents and humans don't drift back into old patterns. - .claude/rules/app-classes.md: replaces the flat endpoint catalog with a taxonomy-aware reorganization (env-scoped / env-admin / agent-only / ingestion / cross-env discovery / admin / other). Adds the flat-endpoint allow-list with rationale per prefix and documents the tenant-filter invariant for ClickHouse queries. - CLAUDE.md: adds four convention bullets in Key Conventions — URL taxonomy with allow-list pointer, slug immutability rule, app uniqueness as (env, app_slug), env-required on env-scoped endpoints. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>