docs: fix agent-doc drift in architecture tree and front-matter index

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	src/safe_outputs/assign_work_item.rs exists and is registered (assign-work-item safe output, documented in docs/safe-outputs.md) but was missing from the src/safe_outputs/ architecture tree listing	AGENTS.md
structure	The permissions-required: front-matter field (deserialized in src/compile/types.rs::FrontMatter) is documented only in docs/imports.md, with no entry/cross-link in the front-matter field reference and example block, making it hard to discover from the primary front-matter page	docs/front-matter.md

Applied Fixes

• Added assign_work_item.rs to the src/safe_outputs/ tree in AGENTS.md, restoring alphabetical accuracy with the actual directory contents
• Added a commented permissions-required: example plus a cross-link to docs/imports.md#permissions-required in the front-matter example block in docs/front-matter.md

Notes

Verified by diffing find src -type f -name '*.rs' output for src/safe_outputs/ against the AGENTS.md tree, and by cross-checking every FrontMatter field in src/compile/types.rs against docs/front-matter.md coverage. All other fields and CLI subcommands (checked against src/main.rs's Commands enum vs docs/cli.md) were confirmed accurate — no other drift found this run.

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Created by the agent-documentation maintainer workflow.

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