Add change-detection and trigger registry (#8)

[zewelor]

• Add change-detection and trigger registry

• Add ChangeDetectionJob and TriggerState model with migration
• Introduce TriggerCollection and stable trigger unique_key values
• Add ChangeDetecting concern for detector triggers and scheduler support
• Have RecurringTasksConfig schedule ChangeDetectionJob for detectors
• Make RunWorkflowJob accept trigger_key and payload; pass payload to workflow
• Add tests and fake trigger; update schema, docs, HTTP client, and add pg gem

• Update app/models/r3x/trigger_state.rb

• Remove HTTP/Discord helpers from WorkflowContext

• Remove fetch_body, discord_output, and http_client methods.
• Change made in lib/r3x/workflow_context.rb.
• Reduce hidden dependencies and side effects in the context.
• Encourage injection of HTTP clients/outputs for testability.

• Make enqueueing atomic for change detection

• Make trigger state update and job enqueue atomic in ChangeDetectionJob
• Add argument normalization to RunWorkflowJob and ChangeDetectionJob
• Add test that simulates enqueue failure and preserves trigger state
• Adjust test payload expectation to use symbolized keys
• Update AGENTS.md to document Solid Queue transactional behavior

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