[PROTOTYPE] Regex for parsing taskoutput results

[LasmarKhalifa]

Regex-based parser prototype for taskoutput's tool result message.

This introduces a helper method that looks for any tag and returns its contents. It's regex-based, which means there are no issues related to unescaped characters. This also means it can be used for error_lines(as shown in this prototype).

The drawback is that in some cases, this can fail (cases such as <status>a</status>x</status>). However, we don't expect this to ever happen in our use cases.

[LasmarKhalifa]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• [PROTOTYPE] Regex for parsing taskoutput results #984 👈 (View in Graphite)
• [PROTOTYPE] REXML for parsing taskoutput tool results #983
• [PROTOTYPE] Taskoutput tool result formatter backed by nokogiri #960
• add task tool result formatter #963
• add agent tool result formatter #962
• 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
• 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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