build: add docker, compose, and CI for runnable kits

[jasperan]

Summary

• add a generic root Dockerfile that builds one runnable kit at a time via KIT_PATH
• add docker-compose.yml with KIT_PATH and KIT_ENV_FILE overrides for local runs
• add a CI workflow that detects changed kits and runs npm ci, npm run lint, and npm run build
• add deployment docs and link them from the root README
• ignore local agent and plan artifacts at the repo root

Notes

• this repo is a collection of kits, bundles, and templates, so the Docker/CI setup targets runnable kit directories instead of pretending there is one root app
• Docker could not be executed locally in this environment because the docker CLI is not installed here

Closes #8

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