Naming coherence across the part layer: the root part's `kebab` field now
matches its `name: 'Provider'`. The `createAttrs` special case still emits
`data-{component}` (no suffix) for the provider part — the DOM contract is
unchanged, only the authoring name changes.
Affected:
- createAttrs special-case: 'root' → 'provider'
- 66 morfos: kebab 'root' → 'provider'
- 77 soma provider files: `attrs.root` → `attrs.provider`, constructor
part arg 'root' → 'provider'
- Docs: A2 rule rewritten, morfo/README, soma/README example updates
- Test / schema / morfo-check: updated for new kebab
Toolbar fix: remove `itemsVersion` counter and per-item `$effect` blocks
that called `notifyItemsChanged()`. The pattern was an A30 violation —
each item's $effect read `ref.current`/`disabled` and wrote back to the
provider, which cascaded through `firstTabStop` → per-item `props`
$derived → DOM reattach → effect re-run, triggering
`effect_update_depth_exceeded` on page load. `isTabStop` now uses
`untrack` around the DOM walk so per-item `props` derivations only
depend on `lastFocusedElement`.
Verification: 7/7 morfo tests, 65/65 smoke, 66/66 morfo-check, no effect
loops detected across any demo page.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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