The closing tag format was <｜/DSML｜tag> but must be </｜DSML｜tag>.
The scanner's closing-tag detection checks text[1] == '/', so the
slash must come immediately after '<', before the first full-width
pipe (U+FF5C). Tags like <｜/DSML｜tool_calls> would not set
closing=true and would not match any tool markup name.
Files fixed:
- internal/toolcall/tool_prompt.go: all closing tags
- internal/promptcompat/prompt_build_test.go: 1 test expectation
f33789399e