refactor(scheduled-task): make Runtime Host the sole global authority

[jackwener]

Summary

• move the global ScheduledTask catalog, clock, fire admission, and recovery into one Runtime Host coordinator
• expose one bounded Host query/mutation protocol and route the Agent tool directly to the same authority
• keep Desktop as a thin IPC proxy plus native local/bot delivery provider
• delete the legacy Desktop scheduler and reverse ScheduledTask authority path
• remove the raw SQLite constructor and duplicate root-barrel export so every writer requires the interactive root lease

Correctness boundaries

• persist stable Session/Turn/Run/message identity before AgentRun admission
• persist native delivery state before crossing the non-replayable effect boundary
• wait durably for a native provider while still allowing safe pause/update/delete
• keep expiry, pagination revision, residency, and change signals under the same Host clock

Validation

• @maka/core build
• @maka/storage build
• @maka/runtime build
• @maka/runtime-host build
• @maka/desktop typecheck

Per request, the local test suite was not run; PR CI is the test authority.