Add applenugs:// deep-link handler (show / track / video)

[tsvb]

What

Implements the app side of the goose-almanac deep-link contract:

applenugs://show/<date>?artist=Goose[&venue=][&song=&set=&pos=][&media=audio|video]

A deep link resolves an artist + date to a nugs container, navigates to it, and starts playback:

• show link → plays from the top
• track link (&song=) → jumps to the matched track
• video link (&media=video) → opens the auto-playing video detail

Registers the applenugs scheme only — nugsnet stays OAuth-only/unregistered to avoid clashing with the official nugs.net app.

How

• Core/DeepLink.swift — pure, unit-tested parser + DeepLinkMatch fuzzy matching (normalize / venue / best-track-index / zero-pad date). No I/O.
• Core/DeepLinkRouter.swift — @MainActor resolver. Audio: bounded paging of artistShows + catalog-search fallback. Video: bounded paging of the per-artist list (no video search exists), date-only match.
• AppModel — serialized deep-link channel (receiveDeepLink / handleDeepLink): a chained deepLinkTask ensures two links — or a link racing the post-login drain — can't interleave their navigate+play steps. A pendingDeepLink slot (last-wins) is replayed after login/bootstrap.
• AppleNugsApp — .onOpenURL wired non-destructively (existing .frame / UITest modifiers untouched). RootView — drains the pending link once .loggedIn.
• project.yml — registers the scheme and adds a standalone, host-free AppleNugsTests unit-test target (bundle.unit-test); DeepLink.swift is compiled into the bundle directly so logic tests run without launching the app.

Review & fixes

After implementation, a multi-agent adversarial review surfaced 8 genuine defects (others dismissed as false positives). All fixed:

• venue mismatch now falls through to search instead of autoplaying the wrong show on a two-show day
• serialized handling prevents interleaved navigate/play
• fetch-before-navigate (no stranded empty detail on fetch failure)
• best-track-index prefers the longest contained title for segue links
• audio resolution paginates (was first-page-only)
• onOpenURL TOCTOU re-check + re-stash
• zero-pad-tolerant date comparison

Testing

• 19 unit tests (parser + matchers), host-free, ~10ms.
• Clean build under SWIFT_STRICT_CONCURRENCY=complete, 0 warnings from new code.
• Verified end-to-end against a real applenugs:// URL with a logged-in session (ad-hoc-signed test build).

Notes

• Auto-play on arrival is intentional (the user came from a "Listen"/"Watch" link).
• AppleNugs.xcodeproj is generated (xcodegen generate), per existing repo convention.

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