refactor: preserve Daily Review on shared authorities

[Astro-Han]

Summary

Daily Review stays a first-class Automations experience while its runtime converges on shared authorities:

• ScheduledTask owns scheduling, timezone, retry, and run now.
• ordinary Runtime Host Session / AgentRun / RuntimeEvent owns execution, recovery, and transcript.
• ordinary Session + Markdown Artifact owns reports; the shared usage ledger is unchanged.

The UI keeps setup, run now, Today / 7 / 30 day navigation, task activity, report history, and backing-schedule management, with a simpler visual hierarchy and no duplicate report rows. The dedicated scheduler, resident state, model path, archive dashboard/store, protocol, and IPC are removed. Net diff: 1,956 lines deleted.

UI comparison

Before	After

Migration and compatibility

Released two- and three-table layouts migrate idempotently. Existing configuration becomes one system-owned Daily Review preset task without changing enablement, timezone, or trigger semantics. Reports become deterministic Sessions, transcript messages, and Artifacts; retirement happens only after replacement writes and snapshot CAS succeed, so failure remains retryable without permanent dual read/write.

Legacy ScheduledTask Agent rows are rebound through canonical connection readiness or paused for repair. Runtime Host compatibility epoch advances to 69. Rolling back after retirement requires the pre-migration backup; migrated Sessions and Artifacts remain ordinary durable data.

Verification

• 74 focused Core, Storage, Runtime Host, UI, and Desktop tests
• 2 focused Desktop Playwright paths
• affected builds and typechecks
• Biome, Astryx inventory, and git diff --check

Full-repository tests were not run.

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Codex implemented the migration, authority convergence, UX preservation, tests, and review fixes. Affected commits carry Generated-by: Codex trailers.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No