docs: prefer Drive handles across adapter heroes and guides

[SutuSebastian]

Summary

• Adapter Confirm heroes (react/preact/solid/vue/angular/svelte) open via Drive handles (useLayer / injectLayer / createLayer) instead of bag-form client.open({ …opts, payload }), matching home snippets and package README taste.
• Guides + concepts flipped Drive-first: awaiting-results, getting-started, error-handling, payload-validation, singletons, identity-and-types, overview, when-to-use. Bag-form stays a documented escape hatch (migration).
• Vue/Svelte skill fire-and-forget examples + Batteries card updated the same way.
• Plan retired; optional pedagogy bullet removed from docs/roadmap.md (done here).
• Patch changeset for @stainless-code/vue-layers + @stainless-code/svelte-layers (shipped skills).

Test plan

• Spot-check adapter Confirm sections show handle .open(payload)
• Guides lead with handle / createLayer; bag-form sections still present where needed
• Batteries “Await a result” card cites wired confirm.open
• blume check green
• Merge with docs label deploys /layers
• Changeset present for vue/svelte patch

[changeset-bot]

🦋 Changeset detected

Latest commit: 1e24ab3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@stainless-code/vue-layers	Patch
@stainless-code/svelte-layers	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 80ed7cf and 1e24ab3.

📒 Files selected for processing (19)

• .changeset/prefer-wired-handles.md
• apps/docs/content/adapters/angular.mdx
• apps/docs/content/adapters/preact.mdx
• apps/docs/content/adapters/react.mdx
• apps/docs/content/adapters/solid.mdx
• apps/docs/content/adapters/svelte/runes.mdx
• apps/docs/content/adapters/svelte/store.mdx
• apps/docs/content/adapters/vue.mdx
• apps/docs/content/concepts/identity-and-types.mdx
• apps/docs/content/concepts/overview.mdx
• apps/docs/content/concepts/when-to-use.mdx
• apps/docs/content/guides/awaiting-results.mdx
• apps/docs/content/guides/error-handling.mdx
• apps/docs/content/guides/getting-started.mdx
• apps/docs/content/guides/payload-validation.mdx
• apps/docs/content/guides/singletons.mdx
• apps/docs/pages/_home/Batteries.astro
• packages/svelte/skills/svelte-layers/SKILL.md
• packages/vue/skills/vue-layers/SKILL.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/prefer-wired-handles

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