Do not promote fenced code examples to tool calls and centralize tool-keyword detection#150

CJackHwang merged 2 commits intocodex/fix-tool-miscall-during-complex-json-testCJackHwang/ds2api:codex/fix-tool-miscall-during-complex-json-testfrom

codex/fix-markup-bypass-in-tool-call-parsingCJackHwang/ds2api:codex/fix-markup-bypass-in-tool-call-parsingCopy head branch name to clipboard