[jeff-schnitter]

Summary

• Add definition-create, definition-list, definition-get, definition-update, definition-delete commands to cortex custom-metrics for full API parity with the custom metric definition endpoints
• Add custom-metric-definitions to backup export/import — definitions are exported as individual JSON files and imported before data points (so import is self-contained)
• Update ai-spend solution to install its metric definition automatically during cortex solutions install via a new custom-metric-definitions/ai-spend.json file; remove the now-unnecessary post-install setup script

Test plan

• cortex custom-metrics definition-create -k my-key -n "My Metric" -V POSITIVE creates a definition
• cortex custom-metrics definition-create -f my-def.json creates from file
• cortex custom-metrics definition-list returns paginated list
• cortex custom-metrics definition-get -k my-key returns definition
• cortex custom-metrics definition-update -k my-key -n "Updated" updates name only
• cortex custom-metrics definition-delete -k my-key deletes definition
• cortex backup export includes custom-metric-definitions/ directory
• cortex backup import creates definitions before data points (409 on re-import = silent success)
• cortex solutions install -s ai-spend self-contained — no post-install step needed

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