v2: read tool duplicates subdirectory AGENTS.md content

Reading a subdirectory AGENTS.md via the read tool loads it twice — once as the tool result and again as a synthetic instruction message. The candidates filter at packages/core/src/tool/read.ts:99 excludes only the Location-root AGENTS.md, not the path just read.

Plugins

N/A

OpenCode version

v2

Steps to reproduce

1. Put an AGENTS.md in a project subdirectory.
2. Start a session at the project root.
3. Have the agent read a file in that subdirectory.
4. The AGENTS.md appears both as the read tool result and as a Instructions from: <path> synthetic message.

Screenshot and/or share link

N/A

Operating System

N/A

Terminal

N/A