docs: sync README, CLAUDE.md, CONSTITUTION & docs site with current framework

[antosubash]

Summary

Brings the living documentation back in sync with the current framework. Audited every factual claim in the project docs against the actual origin/main source (tracked files / SimpleModule.slnx) and fixed the drift.

• README — corrected the framework/, modules/, and packages/ lists to the real shipping set: removed non-existent demo modules (Agents/Marketplace/Orders/PageBuilder/Products/Rag), added the real Identity/Keycloak/Notifications modules, the Testing framework project, the Echo/TsConfig packages, and a tools/SimpleModule.DevTools entry. Fixed the event-bus description (Wolverine IMessageBus + convention handlers, not the non-existent IEventBus/IEventHandler<T>). Switched the module-anatomy example from the removed Products module to the real Tenants module.
• CLAUDE.md — npm run build:dev (not dev:build); diagnostics range SM0001-SM0061; corrected the page-registry failure description (throws a descriptive error + toast, not a silent 404).
• CONSTITUTION & docs site — same page-registry correction; dropped vestigial TickerQ references (background jobs use a custom DatabaseJobQueue + Cronos); added the missing ConfigureAgents lifecycle row to the IModule tables; Inertia 3.x; fixed Customerion→Production typos.

Verification

• Factual accuracy — every changed claim independently verified against the actual code (module set, event bus, Tenants paths, SM0061 range, Cronos/DatabaseJobQueue, ConfigureAgents on IModule, Inertia ^3.0.1, page-resolver behavior in app.tsx/resolve-page.ts). Independent review pass returned zero findings.
• Markdown integrity — balanced code fences across all 11 files; both IModule lifecycle tables column-consistent.
• Scope — docs/markdown only (no code). Browser/QA and code build/test are not applicable; the docs-site (VitePress) build runs in CI on this PR.

Test plan

• CI green (including the VitePress docs build)
• Reviewer spot-checks the README module/framework lists against SimpleModule.slnx