docs: add missing assign_work_item.rs to AGENTS.md safe_outputs tree

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/safe_outputs/assign_work_item.rs exists in the codebase (registered in src/safe_outputs/mod.rs and fully documented under assign-work-item in docs/safe-outputs.md), but it was missing from the safe_outputs/ architecture tree listing in AGENTS.md	AGENTS.md

Applied Fixes

• Added assign_work_item.rs to the safe_outputs/ directory listing in AGENTS.md, in alphabetical order between assign_github_issue_to_user.rs and close_github_issue.rs

Notes

Verified by diffing find src/safe_outputs -name '*.rs' against the file list in AGENTS.md's architecture tree — assign_work_item.rs was the only real gap (all other apparent diff entries belong to other directories/modules, not safe_outputs/). Confirmed the tool is otherwise fully wired: registered in src/safe_outputs/mod.rs and documented in docs/safe-outputs.md (### assign-work-item section), so this was purely a stale file-tree omission in AGENTS.md, not a broader documentation gap.

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Created by the agent-documentation maintainer workflow.

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