[DX-793] [DX-938] Standardize JSON output with envelope format, fail() error handling, and format helpers#157

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umair-ably wants to merge 7 commits intomainfrom

dx-793-json-envelope

Commits on Mar 11, 2026

[DX-793] Add buildJsonRecord utility and CommandError class
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[DX-793] Add JSON envelope and fail() to base classes and services
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[DX-793] Migrate commands to JSON envelope, fail(), and format helpers
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[DX-793] Add NDJSON test helpers and update unit tests for JSON envelope
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[DX-793] Fix e2e tests for JSON envelope format
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[DX-793] Update documentation and skills for JSON envelope patterns
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[DX-793] Migrate placeholder topic commands to BaseTopicCommand and add --json examples
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