add write tool result formatter

[LasmarKhalifa]

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[LasmarKhalifa]

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• add task tool result formatter #963
• add agent tool result formatter #962
• add taskoutput tool result formatter backed by nokogiri #960
• add taskcreate tool result formatter #959
• add taskupdate tool result formatter #958
• add todowrite tool result formatter #957
• add skill tool result formatter #956
• add edit tool result formatter #955
• add write tool result formatter #954 👈 (View in Graphite)
• add grep tool result formatter #953
• add glob tool result formatter #952
• add read tool result formatter #951
• add bash tool result formatter #949
• Centralize tool result error handling in format with error_line helper #948
• main

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[juniper-shopify]

This attribute is consumed by every downstream formatter (#955, #956, #957, and likely more). I would move it to the foundation PR (#948) alongside ok_line and TRUNCATE_LIMIT — that way the Write PR stays a pure single-tool addition, consistent with the pattern in the tool_use stack.

[juniper-shopify]

I'd make this a one-liner.

Suggested change

	path = tool_use_input[:file_path]
	ok_line(path.to_s)
	ok_line(tool_use_input[:file_path].to_s)

and the same in other similar places in the stack.