refactor(cloudflare): extract list + createAndResolve helpers

[Thanukamax]

What

A targeted DRY refactor of src/cloudflare.ts — the resource-provisioning module that felt over-complicated.

Two repeated patterns are factored out:

1. List boilerplate (×6). The verbose
   (await wranglerJson<any[]>([...], { allowFail: true })) ?? []
   appeared six times across ensureD1, ensureKv, deleteD1, deleteKv.
   Now two named helpers: listD1() and listKv().

2. The idempotent create dance (×2). ensureD1 and ensureKv each
   hand-rolled the same "create → re-list → find the new entry → throw if
   still missing" sequence. Folded into one generic createAndResolve helper
   that names the intent.

What did not change

Behavior is identical — same wrangler invocations, same reuse-vs-create
branches, same single batched KV list per run (ensureKv still lists once
up front, so no extra API calls). The only user-visible change is error-message
wording (failed to resolve preview D1 ${name} after create vs the old
... id for ${name}) — arguably clearer.

Honest take: the rest of the codebase is already clean and modular, so I kept
this surgical rather than inventing a big rewrite. cloudflare.ts is where the
real duplication lived. Happy to take it further (e.g. the R2 create/delete
symmetry, or a bindingResourceName map) if you want a bigger pass.

Verification

• bun run typecheck ✅
• bun test ✅ (9 pass)
• bun run lint ✅ (pre-existing info in sync.ts untouched)
• bun run build ✅ — dist/index.cjs regenerated and matches the pinned
  bun 1.3.14 bundler output CI enforces.

Draft for your review — flip to ready whenever.

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