lti-example-tool

Produce complete feature architecture deliverables from informal requests. Use when Codex must convert a rough feature idea into implementation-ready planning documents: product requirements (`prd.md`), functional design (`fdd.md`), and a phased execution plan (`plan.md`) with checkbox task tracking. Prioritize Gleam, Erlang/OTP (BEAM), PostgreSQL, and LTI 1.3 web architecture best practices for this repository.

Implement features and bugfixes for the Gleam-based LTI 1.3 example tool lti-example-tool. Use when asked to debug, investigate, implement, or ship product changes; for larger features, drive execution from docs/features/<feature>/prd.md, fdd.md, and plan.md.