Add agent-friendly enhancements (Step 13)#3

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andreagrandi merged 7 commits intomasterfrom

Mar 5, 2026

Commits on Mar 5, 2026

Add `mb-cli context` command for agent consumption (Step 13a)
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Add `mb-cli schema` JSON introspection command (Step 13b)
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Add TTY auto-detection for smart output format defaults (Step 13c)
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Add --error-format json for structured error output on stderr (Step 13d)
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Add input validation to reject control characters (Step 13e)
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Add --fields flag for JSON field masking on query results (Step 13f)
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Fix gofmt formatting in error_format_test.go
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