Play Framework

chore: purge Python CLI + dead pre-Gradle artifacts (PF-90)

Stage 8 cleanup. Drops framework/pym/ (Python CLI + bundled simplejson/yaml),
per-module commands.py, per-module conf/dependencies.yml (load order is
parsed only from the app's conf/dependencies.yml in Play.loadModules),
resources/module-skel/ (no Gradle playNewModule task), the
application-skel/conf/dependencies.yml that playNewApp was copying then
immediately deleting, legacy resources/{application-,}build.xml,
resources/idea/{iml,ipr}Template.xml from the dropped \`play idealize\`
command, and doc pages for the removed commands (deps, check, id,
idealize, install, list-modules, new-module, dependencies). Adds
__pycache__/ to .gitignore so future stragglers don't slip in.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>