Zero-scope flags list prints columns like App-scoped reads

[isuttell]

Summary

Zero-scope splitch flags list printed indented JSON while App-scoped flags list --app used columns. --summary promised compact human columns on both paths and only kept that promise for the App-scoped read.

This change renders the principal-wide list with the same Flag-read primitives, grouped by org.slug/app.key plus the canonical App ID.

Changes

• Reuse formatHydratedFlag / formatFlagSummaryList for principal_flags_list human output
• Group Flags by App; keep --json as the unchanged principal envelope
• Preserve empty-catalog and truncation notices, and fail loud on contract mismatches
• Align --summary help with the App-scoped "compact human columns" wording
• Add focused formatter and CLI tests for multi-App, empty, truncation, hydrated, summary, and JSON pass-through

Risk: LOW

• Areas touched: CLI Flag-read human renderer only (apps/cli)
• Security: no credentials or Targeting Keys added; App headers still pass through terminalText
• Performance: in-memory grouping of an already-bounded list
• Breaking: human output for zero-scope flags list changes from indented JSON to columns; --json is unchanged

Test plan

• pnpm --filter @splitch/cli test
• pnpm --filter @splitch/cli typecheck
• Pre-commit verify:commit (knip, format, lint, typecheck, secrets)
• Pre-push verify:push
• Hosted Verify on the PR head

Issue: SPL-547

Linear Issue: SPL-547

  

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