fix(clients): resolve file import dialog error and SSE 401

feat: agentic platform — text-to-sql, pedagogy advisor, security hardening & performance

feat: Claude Sonnet 4.6 provider + Stripe billing automation

feat(billing): implement full wallet/ledger system with hard-stop enforcement

feat(billing): enforce AI credit limits across all surfaces

feat: backlog P0→P3 — toast system, payments, tenant isolation, feedback handler, i18n parity

fix(auth): validateApiKey accepts Bearer pattern used by worker

feat: implement whatsapp templates management with security hardening, audit logs, and crm integration

chore: stabilization, audit fixes and project synchronization

fix: security hardening, log all silent catch blocks, remove prisma cast

chore: finalize Sprint P2 & P3 optimizations, baseline prisma migrations, and update technical audit docs

fix: replace non-existent RateLimitReplyContext with inline type

fix: add explicit types to rateLimit errorResponseBuilder parameters

fix: add 'as any' casts to resolve TS2769 plugin registration errors (cors, rate-limit, bullboard)

fix: restore logger compatibility and fix major TS errors in services

fix: rename rate-limit middleware to rateLimit to help IDE resolution

fix: finalize API index imports and cleanup types

fix: resolve IDE errors and missing middleware in API index

feat: B2B SaaS Multi-tenant architecture & Tech Debt Resolution