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* 🛡️ fix: Scope agent-author file access to attached files only
The hasAccessToFilesViaAgent helper short-circuited for agent authors,
granting access to all requested file IDs without verifying they were
attached to the agent's tool_resources. This enabled an IDOR where any
agent author could delete arbitrary files by supplying their agent_id
alongside unrelated file IDs.
Now both the author and non-author paths check file IDs against the
agent's tool_resources before granting access.
* chore: Use Object.values/for...of and add JSDoc in getAttachedFileIds
* test: Add boundary cases for agent file access authorization
- Agent with no tool_resources denies all access (fail-closed)
- Files across multiple resource types are all reachable
- Author + isDelete: true still scopes to attached files only
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