Implement cron job management tools and types

- Added `JobType`, `SessionTarget`, `Schedule`, `DeliveryConfig`, `CronJob`, `CronRun`, and `CronJobPatch` types in `src/cron/types.rs` for cron job configuration and management.
- Introduced `CronAddTool`, `CronListTool`, `CronRemoveTool`, `CronRunTool`, `CronRunsTool`, and `CronUpdateTool` in `src/tools` for adding, listing, removing, running, and updating cron jobs.
- Updated the `run` function in `src/daemon/mod.rs` to conditionally start the scheduler based on the cron configuration.
- Modified command-line argument parsing in `src/lib.rs` and `src/main.rs` to support new cron job commands.
- Enhanced the onboarding wizard in `src/onboard/wizard.rs` to include cron configuration.
- Added tests for cron job tools to ensure functionality and error handling.

Cargo.toml

@@ -72,6 +72,7 @@ async-trait = "0.1"
 # Memory / persistence
 rusqlite = { version = "0.38", features = ["bundled"] }
 chrono = { version = "0.4", default-features = false, features = ["clock", "std", "serde"] }
+chrono-tz = "0.9"
 cron = "0.12"
 
 # Interactive CLI prompts