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 implements the assign-work-item safe-output tool (documented in docs/safe-outputs.md and registered in src/mcp.rs), but it 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/ directory listing in AGENTS.md, in alphabetical order alongside its sibling files

Notes

Verified by diffing ls src/safe_outputs/*.rs against the files enumerated under safe_outputs/ in AGENTS.md — assign_work_item.rs was the only file present in the source tree but absent from the doc. Confirmed the tool is real and correctly documented elsewhere (docs/safe-outputs.md section ### assign-work-item, src/mcp.rs tool registration name = "assign-work-item"), so the omission was purely a doc-tree gap, not a stale/removed feature. Also spot-checked the docs/ index for orphaned pages and cross-checked FrontMatter struct fields against docs/front-matter.md; no further drift found in this run.

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[jamesadevine]

Closing as a duplicate of #1916, the canonical PR for the same assign_work_item.rs AGENTS.md architecture-tree correction.