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

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/safe_outputs/assign_work_item.rs exists (implements the assign-work-item safe output already documented in docs/safe-outputs.md) but was missing from the src/safe_outputs/ file listing in the AGENTS.md architecture tree	AGENTS.md

Applied Fixes

• Added assign_work_item.rs to the safe_outputs/ tree in AGENTS.md, in alphabetical position between assign_github_issue_to_user.rs and close_github_issue.rs

Notes

Verified by running find src -type f -name '*.rs' and diffing the resulting file list against every file referenced in the AGENTS.md architecture tree. assign_work_item.rs was the only genuine omission (the other differences were intentionally-collapsed ir/tasks/ builder files, which AGENTS.md already documents as folded into one entry). Also cross-checked the CLI Commands enum in src/main.rs against docs/cli.md and the front-matter/safe-outputs docs against their respective source modules; no further drift found in this pass.

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Created by the agent-documentation maintainer workflow.

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