Add a tom_select generator and run it from core_setup

[OutlawAndy]

Why?

No generator sets up Tom Select, even though the rspec generator's SelectHelper already drives it. Apps copy the input and Stimulus controller from each other by hand. fujifilm_cimba's copy has Stimulus actions that keep Tom Select's selected values through a Turbo morph. tarsco_bolted_tank's has the better settings. Turbo morphs are now routine because turbo_form re-renders dynamic forms by morphing. This PR combines the two and makes that the default.

What Changed

• New rolemodel:tom_select generator, modeled on rolemodel:tailored_select:
  • adds the tom-select package and imports tom-select/dist/css/tom-select.css
  • adds a tom-select Stimulus controller, bound to the <select> itself, and updates the manifest. Its settings come from tarsco_bolted_tank: create from the input's allow_create: option, delimiter: null, the search text clears after a pick, and remove_button only for multiple selects. There's no dropdown_input plugin, so the rspec SelectHelper can type into the control.
  • its morph handling comes from fujifilm_cimba. turbo:before-morph-element saves the current markup into Tom Select's revert settings and destroys the instance. turbo:morph-element rebuilds it. Both are :self actions on the select, so nothing depends on a page-wide morph handler.
  • if SimpleForm is present, adds tom_select and grouped_tom_select inputs that attach the controller and both morph actions. The grouped input gets the morph actions too.
• The inputs call super with the Stimulus options merged into wrapper_options, instead of re-implementing SimpleForm's input. Rendered in tarsco_bolted_tank, the HTML matches tarsco's input for plain, allow_create: and custom data: cases, apart from the added morph actions.
• rolemodel:core_setup and rolemodel:all run rolemodel:tom_select right after rolemodel:simple_form
• The all generator spec derives the expected generators from lib/generators/rolemodel instead of a hard-coded list. It expects a directory's own all generator when it has one, and keeps a named exclusion list (core_setup, tailored_select). That showed rolemodel:all never ran rolemodel:turbo:all, so it does now, and the rolemodel:all README lists the Turbo generators in place of a dead ./modals link.
• rolemodel:simple_form drops its Bundler.with_unbundled_env wrapper. bundle_command already runs in Bundler.with_original_env.

Pre-merge checklist

• Update relevant READMEs (root README, generators README, core_setup README, new tom_select README/USAGE)

Notes

• Left out tarsco's sync action, which re-syncs every tom-select 100ms after any Turbo Stream renders. It's left over from turbo_fetch. A stream that replaces the select reconnects the controller anyway.
• No Optics-specific styling. cimba's and tarsco's overrides depend on their own SCSS. The stock Tom Select stylesheet is imported instead.
• Full suite passes locally (110 examples).

Screenshots

N/A — no UI changes in this gem

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