update tests and refine app

Add curriculum version surface

Split API routes and add backend health checks

Use list lookups for optional rows

Handle chat and lookup failures safely

Harden live editor chat streaming

Add modular agent tool registry

Potential fix for pull request finding 'CodeQL / Information exposure through an exception'

initial commit - agent with attachment

initial diff engine for agentic changes

sample chat template for editor

Harden refinement and add Sentry monitoring

Refine curriculum preview generation

test ai pipeline

fix table

template preview test

input stored in db

submission