Create a Flow Production Tracking (FPTR) Toolkit App

This skill guides developers and pipeline engineers through building an FPTR app, following a spec-driven way — capture intent, check for reuse, write and validate a spec, plan, then implement, verify, release, and maintain against that spec. Tell the user which phase (below) you're starting before acting in it, so they can track progress and step in between phases.

Reference guide: Developing a Toolkit App Default app template repo: https://github.com/shotgunsoftware/tk-multi-starterapp

App spec-driven lifecycle

Each step below that has mechanical how-to links to a references/*.md guide — read it while executing that step, not before; keep the skill itself light and pull in detail only when it's actually needed. Phases 2, 7, and 9 have no dedicated guide — they're about the spec and process rather than a tool/config action.