fix: remember workspace surface preferences

[CompleteDotTech]

Closes #3584

Summary

• add a versioned, typed Workspace preference registry mounted above remounting surfaces
• migrate durable controls across GitHub, Tasks, Schedules/Calendar, Familiars/Memory, Marketplace, Grimoire, and Browser; retain and bridge existing Grimoire open-tab storage
• preserve explicit deep-link destinations, migrate legacy keys, clear stale GitHub scope/selection safely, and leave search/modal state transient
• add registry round-trip/migration/normalization/source-wiring coverage and register it with the app suite

Deep-link and stale-value behavior

Explicit navigation targets win for the current visit without replacing the saved preference. Saved GitHub organization, repository, and selected semantic target are checked against fresh data and only an invalid field is cleared.

Non-goals

This does not restore search text, dialogs, popovers, drawers, confirmation or destructive flows, toasts, undo state, busy/error state, or temporary selection modes.

Verification

• pnpm exec tsc --noEmit --pretty false
• pnpm check:tests-wired
• targeted registry, GitHub, Board, Calendar, Familiars, Browser, and Schedules source-contract tests
• CI typecheck passed on the prior exact head; the latest exact-head CI is running

Environment note

pnpm lint:design cannot run in this isolated worktree because it has no local node_modules (eslint: not found).