Cron Adapter

[raphael-goetz]

Resolves: #80

[Copilot]

Pull request overview

Implements a new Cron-based adapter service to trigger stored flows on a schedule (resolves #80).

Changes:

• Added a new adapter/cron Rust binary crate implementing the Cron adapter loop and flow identification.
• Registered the new adapter in the workspace and introduced workspace-level chrono and cron dependencies.
• Updated Cargo.lock to include the new crate and transitive dependencies.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

File	Description
adapter/cron/src/main.rs	Adds the Cron adapter runtime loop and CRON_* flow-setting based matching.
adapter/cron/Cargo.toml	Defines the new cron adapter crate and its dependencies.
Cargo.toml	Adds the cron adapter to the workspace and introduces shared dependency versions.
Cargo.lock	Locks new direct/transitive dependencies introduced by the cron adapter.

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