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feat(compiler,babel-plugin,solid): componentNames flag — component owner labels that survive minification (#3340)

Compiler flag `componentNames` (off by default): DOM output carries the tag as written in source as a third `createComponent` argument (`<Home />` → `createComponent(Home, props, "Home")`, `<Ui.Button />` → `"Ui.Button"`, `<For>` → `"For"`, `<this.Row />` → `"this.Row"`), and the dev/observe runtimes label the component's owner with it, so observe-tier production bundles report hot scopes and holds by component instead of whatever the minifier left of the function name. DOM output only: SSR keeps inlining `Comp(props)` (pinned by the `ssrInert` fixture in both compilers), universal/dynamic never emit. Off → byte-identical output. Prod runtime ignores the argument.

Parity: shared `__dom_component_names_fixtures__`, a `dom-component-names` mode in the parity harness compiling every existing fixture through the flag (zero divergences), and per-fixture `options.json` support in the harness.

`@solidjs/vite-plugin` turns the flag on for the dev posture and a new `observe` posture in a follow-up once the compiler release carrying the option is out.

Co-authored with Claude via Cursor.

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