fix(runner): remove exponential backtracking from the content-disposition filename regex

[mmabrouk]

CodeQL flagged the quoted-filename regex in the runner's attachment client (js/redos, high): the escape branch \\. and the plain branch [^"] both match a backslash, so an unterminated quote full of escape pairs backtracks exponentially. The header comes from our own API, so exploitation needs a compromised or misbehaving server, but the fix is one character class: the plain branch now excludes the backslash, making the alternation unambiguous and linear. A regression test feeds the hostile shape (50,000 escape pairs, no closing quote) and bounds the parse time. Well-formed inputs parse identically, pinned by the existing cases.

https://claude.ai/code/session_01McMogkcDRV7UpSAjfd8VKG

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview	Aug 1, 2026 6:29pm

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