* fix(#2017: grant mcp__plugin_context7_context7__* for plugin-marketplace context7
The 8 context7-using agents granted only mcp__context7__* (standalone server
form). Claude Code's plugin-marketplace context7 install names tools
mcp__plugin_context7_context7__*, so the grant never matched and every
researcher/planner/executor silently lost doc lookup (fell back to WebSearch).
- 8 agents: add mcp__plugin_context7_context7__* alongside mcp__context7__*.
- scripts/research-profiles.cjs: update the researcher profile tools to match.
- tests/context7-plugin-grant-parity.test.cjs: regression guard — no agent
grants the standalone form without the plugin form.
Closes#2017
* docs(#2017): backfill changeset pr 2029