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 (backing the assign-work-item safe-output tool, already documented in docs/safe-outputs.md) was missing from the src/safe_outputs/ architecture tree in AGENTS.md	AGENTS.md

Applied Fixes

• Added assign_work_item.rs to the src/safe_outputs/ listing in AGENTS.md, in alphabetical order

Notes

Verified by diffing find src -type f -name '*.rs' against every file path referenced in the AGENTS.md architecture tree. All other source files (including the ir/tasks/ typed-task builders, which AGENTS.md intentionally summarizes rather than enumerating) are already covered. docs/cli.md was cross-checked against the Commands/SecretsCmd enums in src/main.rs and found accurate; no other drift was found in this pass.

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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.