docs(ios): document v6 removal of *View factories + ply/products/ply/plans deeplinks

[kherembourg]

What & why

The iOS SDK (PR #653) removed two more surfaces on the way to v6:

1. The SwiftUI embedded-view factories — Purchasely.productView(...) / planView(...) / presentationView(...) (the SwiftUI counterpart to the already-removed UIKit *Controller factories), which still carried the legacy (PLYProductViewControllerResult, PLYPlan?) completion block.
2. The ply/products/* and ply/plans/* deeplink formats (and the internal productController factory that served them).

This PR updates the plugin's iOS references and skills so they recognize, flag, and migrate both.

Changes

• references/ios/migration-v6.md — summary-table rows for the *View factories and the removed deeplinks; §3 / §5 now name the SwiftUI factories alongside the UIKit ones; a new "Product / plan deeplinks removed (breaking)" subsection; two checklist items; the verify-grep gains productController|planController|productView|planView|presentationView|ply/products|ply/plans.
• references/ios/v5-api-reference.md — recognition tokens, a SwiftUI-factory removal entry, and a deeplink-format removal entry.
• purchasely-migrate — iOS recognition tokens + the embedded-UI / deeplinks steps.
• purchasely-review — removed-API pattern lists and the "No removed / deprecated APIs" check now list the full *View / *Controller families and the removed deeplink formats. Also dropped the non-existent presentationViewControllerFor token.
• purchasely-sdk-expert — removed-API list.
• CHANGELOG.md — [Unreleased] entry.

Replacement guidance documented

Removed	Use instead
productView / planView / presentationView	PLYPresentationBuilder.…build().preload { … } → presentation.swiftUIView
ply/products/* / ply/plans/*	ply/presentations/<id> or ply/placements/<id>

Verification

• node scripts/guard-known-bad-snippets.mjs → passed.
• No removed API is presented as valid v6 in references/ios/api-reference.md (0 hits).

🤖 Generated with Claude Code

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Also in this PR — fix the iOS default presentation handler

iOS v6 renamed setDefaultPresentationResultHandler { result, plan in } → setDefaultPresentationDismissHandler { outcome in } (now delivers PLYPresentationOutcome, mutually exclusive with per-presentation onDismissed). The plugin still documented the old name as a valid v6 API (references/ios/api-reference.md) and listed it under "unchanged in v6" (references/ios/v5-api-reference.md). Fixed both, plus the purchasely-migrate / purchasely-review / purchasely-debug skills.

Platform-aware: Android v6 keeps the setDefaultPresentationResultHandler name and only changes the callback to a single outcome (verified against Android/MIGRATION_V6.md), so the cross-platform skills no longer imply the iOS rename applies to Android.

Platform	v6 default handler
iOS	setDefaultPresentationDismissHandler { outcome in } (renamed)
Android	setDefaultPresentationResultHandler { outcome -> } (name kept, callback now single outcome)

[greptile-apps]

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