Adds two new fields to detect's JSON output:
- gbrain_mcp_mode: local-stdio | remote-http | none
Resolved via 3-tier fallback (codex Finding D3): claude mcp get --json
→ claude mcp list text-grep → ~/.claude.json jq read. If Anthropic moves
the file format, the first two tiers absorb it.
- gstack_artifacts_remote: HTTPS URL from ~/.gstack-artifacts-remote.txt
Falls back to ~/.gstack-brain-remote.txt during the v1.27.0.0 migration
window so detect doesn't return empty between upgrade and migration.
Existing detect tests still pass (15/15). New 19 tests cover every fallback
tier independently, plus a schema regression for /sync-gbrain compat.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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