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 (backing the documented assign-work-item safe output in docs/safe-outputs.md) but was missing from the safe_outputs/ module listing in the AGENTS.md architecture tree	AGENTS.md

Applied Fixes

• Added assign_work_item.rs to the safe_outputs/ tree in AGENTS.md, alphabetically ordered after assign_github_issue_to_user.rs

Notes

Verified against ls src/safe_outputs/*.rs (245 total .rs files repo-wide checked via find src -type f -name '*.rs'). Confirmed the file is registered in src/safe_outputs/mod.rs, wired into src/mcp.rs (assign-work-item MCP tool), src/execute.rs (Stage 3 executor dispatch), src/inspect/catalog.rs, and already documented end-to-end in docs/safe-outputs.md (### assign-work-item section) and docs/front-matter.md — only the AGENTS.md architecture-tree entry was missing. Cross-checked other high-churn areas (docs/cli.md command list, src/compile/codemods/, src/compile/extensions/exec_context/) against source and found no further drift, so this is the single focused fix for this run.

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Created by the agent-documentation maintainer workflow.

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