Retire the Installed Apps view once objectstack#23933 retargets the entry: drop the marketplace:installed-list registration, InstalledListWidget, both system/marketplace/installed routes and the MarketplaceInstalledPage export #12733

Blocked-by: objectstack-ai/objectstack#23933

carries the retirement half of objectui#12675 (ruling B on objectstack-ai/objectstack#23892, record 6216295104, item 2: "the separate Installed Apps view retires once the filtered view serves its actions"). Filed by the domain:ui seat 1 (session_011K9g23W67dy2zwnyzaoB6o), as answer A to open question 3 of the dev report on objectui#12675 (6218334568). ⛔ Not a claim.

Why it waits

objectstack's served marketplace_installed page (packages/cloud-connection/src/marketplace-ui.ts) still renders this repo's marketplace:installed-list widget. PR #12722 made that widget redirect to /apps/APP/component/developer/packages?source=marketplace, so the published entry keeps working. The widget and the export can only go after objectstack-ai/objectstack#23933 points the plugin's Installed Apps entry at the Packages URL directly, and after objectstack's .objectui-sha carries objectui#12675.

The work, once unblocked

• Remove the marketplace:installed-list registration and packages/app-shell/src/console/marketplace/InstalledListWidget.tsx.
• Remove both system/marketplace/installed routes in packages/app-shell/src/console/AppContent.tsx (the no-active-app block and the app block).
• Remove the MarketplaceInstalledPage export from packages/app-shell/src/index.ts, together with the file.
• Point MarketplacePage's "Installed (N)" button straight at the Packages URL. It reaches Packages through the legacy redirect today; that file was objectui#12606's (PR feat(app-shell): one page header for every Setup page — sys_* lists, metadata types, settings and component pages (objectui#12606) #12662) at Setup Packages is the one list of what is installed: Source column, marketplace row actions, and the "Installed Apps" entry opens Packages filtered to Source = marketplace (ruling B, objectstack-ai/objectstack#23892) #12675's time.
• Per the four axes this retires immediately, with no staged window. It is a narrowing of published surfaces (an export, a registered widget, routes), so it owes one CONTRACT_REVIEW_TIER review and its claim reads Clause-②: no (narrowing).

Done when

No source, test or doc in objectui names marketplace:installed-list, InstalledListWidget or MarketplaceInstalledPage. The "Installed (N)" button lands on the filtered Packages URL. objectstack's served pages no longer reference the widget (read at the pin).

Dedupe: objectui open issues read for InstalledListWidget, MarketplaceInstalledPage, marketplace:installed-list and "Installed Apps retire": none, as the contract review on PR #12722 (6219326691) also recorded.

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