Add ->command helper fn

[bpringe]

Closes #9

I tested the example app demo code after the changes.

[bpringe]

Added @ for convenience - so the value of counters is returned when this form is evaluated.

[Copilot]

Pull request overview

Adds a cp/->command helper to standardize command construction by ensuring :command/id and :command/timestamp are present, and updates the example/demo and server-side decoding to use it.

Changes:

• Introduces ai.obney.grain.command-processor-v2.interface/->command (backed by core/->command) to fill missing :command/id and :command/timestamp.
• Updates the command request handler to drop any client-supplied :command/id/:command/timestamp and regenerate them server-side via ->command.
• Updates the example app demo and adds unit tests covering ->command behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
development/src/example_app_demo.clj	Uses cp/->command in REPL/demo snippets and cleans up trailing comment return forms.
components/command-request-handler-v2/src/ai/obney/grain/command_request_handler_v2/core.clj	Regenerates command id/timestamp server-side via cp/->command after dropping client-supplied values.
components/command-processor-v2/test/ai/obney/grain/command_processor_v2/interface_test.clj	Refactors command test helper to use cp/->command and adds focused tests for ->command.
components/command-processor-v2/src/ai/obney/grain/command_processor_v2/interface.clj	Exposes the new public ->command helper in the interface namespace.
components/command-processor-v2/src/ai/obney/grain/command_processor_v2/core.clj	Implements ->command to populate defaults using random-uuid and time/now.

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