v1.7.1 — cross-domain gotchas catalog

[1.7.1] - 2026-06-17 — cross-domain gotchas catalog

Added

• rules/gotchas.md — consolidated footgun reference covering upgrade/migration,
  security, graph, vector, SurrealQL, MCP, SDK, and operational gotchas (v3.1.4+).
• AGENTS.md decision tree for "surprising SurrealDB behavior / gotcha" queries.
• gotchas capability in onboard.py --agent manifest.

Changed

• rules/graph-queries.md — renamed section to "Graph Gotchas" with pointer to
  rules/gotchas.md for cross-domain coverage.
• rules/surrealql.md — replaced stale v3.1.0-alpha stub with v3.1.4 patch
  notes summary linking to gotchas and deployment rules.