fix(json): audit and standardize JSON output across commands (bd-au0.7)
Audit findings:
- All commands properly respect --json flag for success output
- Added outputJSONError() helper for consistent JSON error output
- Removed redundant local --json flag from stale.go (inherited from rootCmd)
- Fixed stale_test.go to check InheritedFlags() instead of local Flags()
JSON output patterns verified across:
- Query commands: ready, blocked, stale, count, stats, status
- Dep commands: dep add/remove/tree/cycles
- Label commands: label add/remove/list/list-all
- Comment commands: comments add/list
- Epic commands: epic status/close-eligible
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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