docs(ios): document six public APIs that currently only appear in the changelog

[0xwurdig]

What changed and why

While auditing the iOS reference against the SDK source, I found six public members that carry doc comments in the SDK but appear nowhere in the published docs except the changelog — no reference page, no guide. I checked every one of the 603 pages in content/.

Symbol	Declared at	Currently documented?
getAssignments()	Superwall.swift:746	Nowhere at all — zero mentions in the iOS docs
configurationStatus	Superwall.swift:203	Changelog only
isPaywallPresented	Superwall.swift:385	Changelog only
latestPaywallInfo	Superwall.swift:190	Changelog only
togglePaywallSpinner(isHidden:)	Superwall.swift:1078	Changelog only
SuperwallOptions.maxConfigRetryCount	SuperwallOptions.swift:378	Changelog only

The first three are the ones I'd most expect to reach for when debugging, which is why they seemed worth raising:

• configurationStatus is the supported way to know whether config finished — the answer to "why isn't my paywall showing yet". It's @Published, so it binds in SwiftUI and Combine.
• getAssignments() answers "which variant is this user actually in", and is easy to confuse with confirmAllAssignments() — one is synchronous and reads stored state, the other is async and confirms. The added snippet notes the difference.
• maxConfigRetryCount is the knob that makes register(placement:) surface PaywallPresentationHandler.onError faster on a bad connection.

togglePaywallSpinner(isHidden:) is a nice case of a one-way link: its own doc comment points at SuperwallDelegate.handleCustomPaywallAction(withName:), but nothing points back at it, so you'd only find it by reading the source.

The change

• Superwall.mdx — adds the five members to the signature block, plus usage snippets in the page's existing style.
• SuperwallOptions.mdx — adds maxConfigRetryCount to the signature block, the TypeTable, and the basic-setup example.

No new pages and no meta.json changes; everything slots into the existing pages so navigation is untouched. All behaviour described is taken from the SDK source rather than inferred — ConfigurationStatus cases are pending / configured / failed, and maxConfigRetryCount defaults to 6 and clamps negatives to 0.

Happy to trim this if any of these are intentionally undocumented — I couldn't tell from the outside, and each one is a self-contained hunk so they're easy to drop individually.

Testing performed

• bun install --frozen-lockfile
• bun run build:cf — succeeds, 602 pages prerendered, search index generated
• bun test — 64 pass, 0 fail
• Verified every link target added here exists: register.mdx, PaywallPresentationHandler.mdx, configure.mdx

Only content/docs/** touched. Nothing under public/. Not deployed.

Separate from #265, which fixes the handleLog signature.